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The Complete Guide To Universal Seat Sliding Runners: Every Runner We Sell, Measured

A customer settles on a seat, works out the bracket for the car, and then Cameron asks whether they want it to slide. Runners are the last part people order and the easiest to get wrong, so we have measured every one we sell: runner widths, bolt patterns, the height each one adds and how far it moves.

  • Cobra, Corbeau, Sparco, OMP, Recaro, PCI, Endurance and Tillett
  • Figures from maker drawings, catalogues and fitting sheets
  • Live prices on every runner
  • Checked 10 November 2026
Three seat runner release handles of different widths nested inside one another beside PCI, Sparco and Corbeau stickers
PCI, Sparco and Corbeau handles nested together. Each bar sits between the tracks, so it measures a little narrower than the width in the name.
The short answer

Match the runner width to the seat

291, 345 or 405mmthe three you will meet most

The number in a runner's name is the width it sets the tracks at, which is the seat's bolt spacing. It is never the travel.

  • Cobra pattern seats take a 291mm runner; Sparco, OMP and Corbeau Standard take 345mm; Recaro seats sit at about 405mm
  • A runner bolts to anything flat and strong: a vehicle bracket, a frame or a drilled floor
  • One kit does one seat, unless the listing says pair
  • Runners add 24mm to 28mm of seat height on the makers' own figures, and about 26mm on the rest by our estimate
3Bolt patterns cover most seats
291 to 405mmRunner widths
24 to 28mmHeight added, maker figures
130 to 250mmTravel, maker figures

What a sliding runner does

A lower rail bolts down to whatever is underneath, an upper rail bolts up to the seat, and a locking mechanism with a handle across the front holds them together. Lift the handle and the seat slides; let go and it locks. It has barely changed in thirty years.

Where people come unstuck is underneath. A runner has no vehicle specific mounting in it at all. The holes in the bottom rail are the runner maker’s own, so they will not line up with the car’s factory seat points on their own. Underneath, it bolts to anything flat and strong: a Planted or other vehicle bracket, a frame, or a floor drilled to suit. Above it you need a seat drilled to the matching pattern.

0mm5mm10mm15mm20mm25mm30mmSeat onlybolted straight downno runner24mmTillett STRI / STROTillett figure+24mm24.55mmCobra PremiumCobra drawing+24.55mm~26mmMost other brandsour estimateabout +26mm28mmTillett PTRI / PTROTillett figure+28mm
Every seat sits on the same mounting line, so the only difference is the runner. Heights to scale from the maker figures; the dashed one is our estimate for the brands that do not print a figure. The seat outline is for illustration.
Runners are never car specificA runner answers to the seat, never to the car. If you are pricing a full conversion, the order is seat first, then the runner that matches it, then whatever it bolts down to: a vehicle bracket, a frame or the floor itself. Tell us the car and the seat and we will put the lot together before you spend anything.

The number in the name is the width between the tracks

Nearly every runner we sell has a millimetre figure attached to it. That figure is the width the two tracks are set at, which matches the bolt spacing on the seat. It is not the length of the rail and it has nothing to do with how far the seat travels.

Cameron gets asked most weeks whether the 405 slides further than the 291. It does not. The tracks sit under the seat at its bolt spacing and the handle sits between them, so the handle itself measures less than the number: Corbeau’s Motorsport Standard handle is 320mm across and sets the runners at the 345mm pattern. Match the number to the seat and the rest follows.

291mmCobra, CorbeauCobra pattern seats345mmSparco, OMP, Corbeau, EnduranceSparco pattern seats370mmCorbeau Motorsport Lwider side mounted shells405mmRecaro, Cobra, Corbeau XL, EnduranceRecaro and wide shells
Each pair of tracks drawn at the width in its name, to one scale, looking down with the handle across the front. The handle sits between the tracks, so it measures less: 320mm on the 345mm Corbeau Standard. The width matches the seat's bolt spacing; it says nothing about how far the seat slides.
Corbeau seat runner release handle laid flat with a tape measure running beneath it
A Corbeau handle on the tape. Corbeau sell four widths at one price, so pick the one that matches the seat.

The three bolt patterns that matter

Turn a base mount seat over and there are four bolt holes in the bottom. Across the aftermarket there are really only three arrangements of those four holes. Cobra’s drawings put theirs at 292mm across by 330mm front to back. Sparco drill 345mm by 271mm, and OMP print 345 by 270mm. Recaro sit wider at about 405mm across; Recaro do not print a front to back figure, so measure yours.

None of the three line up with each other, which is why a Cobra runner will not go under a Sparco seat. Pick two patterns below to see them on top of each other at the same scale, Tillett’s own included. Corbeau are the useful exception: they drill their recliners for both the Cobra and the Sparco patterns, so a Corbeau seat leaves either route open.

Cobra: 292 x 330mm on Cobra drawings (sold as the 291 runner). Cobra base mount seats and recliners, Corbeau Sportline and Classic.Sparco / OMP: 345 x 271mm (OMP print 345 x 270mm). Sparco and OMP base mounts, Corbeau Standard.Tillett STRI / PTRI: 315 x 315mm (Tillett). Tillett seats on inward brackets; the PTR adds a second hole at 345mm.Tillett STRO / PTRO: 405 x 315mm (Tillett). Tillett seats on outward brackets, with a handle 90mm wider.Cobra: 292 x 330mm on Cobra drawings (sold as the 291 runner). Cobra base mount seats and recliners, Corbeau Sportline and Classic.Sparco / OMP: 345 x 271mm (OMP print 345 x 270mm). Sparco and OMP base mounts, Corbeau Standard.Tillett STRI / PTRI: 315 x 315mm (Tillett). Tillett seats on inward brackets; the PTR adds a second hole at 345mm.Tillett STRO / PTRO: 405 x 315mm (Tillett). Tillett seats on outward brackets, with a handle 90mm wider.
front of the seatrear292mm across330mm front to back345mm across271mm front to back315mm across315mm front to back405mm across315mm front to back292mm across330mm345mm across271mm315mm across315mm405mm across315mm
Looking down on the seat base, both patterns to one scale, measured between bolt centres. If the four holes of your seat do not sit on one of these, measure it and tell us the two numbers.
Every pattern on its ownscroll for all 4

Cobra pattern

292mm x 330mm, between bolt centres

front of the seat292mm across330mm
Across
292mm
Front to back
330mm
Seats
Cobra base mount seats and recliners, Corbeau Sportline and Classic.

Sparco / OMP pattern

345mm x 271mm, between bolt centres

front of the seat345mm across271mm
Across
345mm
Front to back
271mm
Seats
Sparco and OMP base mounts, Corbeau Standard.

Tillett STRI / PTRI pattern

315mm x 315mm, between bolt centres

front of the seat315mm across315mm
Across
315mm
Front to back
315mm
Seats
Tillett seats on inward brackets; the PTR adds a second hole at 345mm.

Tillett STRO / PTRO pattern

405mm x 315mm, between bolt centres

front of the seat405mm across315mm
Across
405mm
Front to back
315mm
Seats
Tillett seats on outward brackets, with a handle 90mm wider.
The two minute checkTurn the seat over and measure between the centres of the two front holes, then from the front hole to the back hole down one side. Those two numbers tell you which pattern you have. Recaro's front to back figure moves a little between seats, so put a tape on those rather than going off the brochure.

Height added and travel, runner by runner

A runner sits between the bracket and the seat, so its thickness goes straight onto your seat height. Where the maker prints it, that thickness runs from 24mm to 28mm. The makers that do not print a figure sit at about 26mm by our estimate. In a saloon you will never notice. In a low car with a helmet on, that is the difference between comfortable and brushing the headlining, so it is worth knowing before the seat goes in.

Travel is the other number people ask about. Where makers print it, it runs from 130mm on Recaro’s FIA mount for the P1300 GT to 250mm on Tillett’s PTR runners; dashed bars are retailer figures. Hover a row for its figures; anything a maker does not publish is marked as such.

HEIGHT ADDEDFORE AND AFT TRAVEL0mm10mm20mm30mm40mm0mm50mm100mm150mm200mm250mmTillett PTRO: 28mm high, 250mm travelTillett PTROTillett PTRI: 28mm high, 250mm travelTillett PTRICobra standard: 28mm high, 240mm travelCobra standardPCI universal sliders: about 26mm high, 245mm travelPCI universal slidersRecaro double locking: about 26mm high, 220mm travelRecaro double lockingCorbeau runners: about 26mm high, 213mm travelCorbeau runnersEndurance runner kit: about 26mm high, 213mm travelEndurance runner kitEndurance track day 345: about 26mm high, 213mm travelEndurance track day 345Endurance Recaro 405: about 26mm high, 213mm travelEndurance Recaro 405Sparco runner kit: about 26mm high, travel not publishedSparco runner kitOMP slider kit: about 26mm high, travel not publishedOMP slider kitCobra Premium: 24.55mm high, 240mm travelCobra PremiumTillett STRI: 24mm high, 250mm travelTillett STRITillett STRO: 24mm high, 250mm travelTillett STRORecaro FIA mount (P1300 GT): height not published, 130mm travelRecaro FIA mount (P1300 GT)OMP RTS frame and slider: height not published, travel not publishedOMP RTS frame and slider28mm250mm28mm250mm~28mm240mm~26mm245mm~26mm~220mm~26mm213mm~26mm213mm~26mm213mm~26mm213mm~26mmnot published~26mmnot published24.55mm240mm24mm250mm24mm250mmnot published130mmnot publishednot publishedMaker figureEstimate or retailer figure

If height is the problem, our tall and long side mounts guide covers the other end of the stack, and the seat spacers guide covers lifting a seat.

Cobra runners

Cobra keep it simple. One runner design, two widths, and both bolt to Cobra’s own subframes. The standard runner has been the same part for years and does the job on any Cobra base mount seat. The Premium runner took over as the default on Cobra subframe applications in 2020, and it is the one Cobra expect to see under their vehicle specific kits.

The 291mm handle covers the Clubman and Monaco buckets and every Cobra reclining seat, Daytona and Misano included. The 405mm handle is for Cobra’s motorsport seats up on side mounts. Cobra’s own drawings for the Premium put it at 24.55mm high, with 240mm of travel (110mm forward and 130mm back) on a 355mm upper rail; every Cobra runner moves the same 240mm, and the 292mm and 405mm in the drawing names are the side to side hole spacing. The standard runner is £59.00 a seat and the Premium £84.00; both widths cost the same, so choose on the seat alone.

  • Premium runner, part SUBFR07EL: 24.55mm high, 240mm of travel (Cobra drawings)
  • Standard runner, part SUBFR07, the long-running original
  • Widths 291mm and 405mm on both
  • Boxed 291mm pair, and a complete sliding fitting kit for the Nogaro

Corbeau runners

Corbeau give you more choice than anybody else, and this is the range Cameron reaches for when a seat from one brand meets a bracket from another. One runner design, double locking, four widths on our listing, one price whichever you pick, so the width is purely about fit. Corbeau print 213mm of travel: 120mm forward and 93mm back.

Retro / Sportline at 291mm suits Corbeau classic seats and anything on the Cobra pattern. Standard at 345mm opens up Sparco and OMP base mounts alongside Corbeau’s own. Motorsport L at 370mm and XL at 405mm are for side mounted shells, and the XL doubles as the Recaro size. A single seat is £58.80; the boxed pairs come in 291, 345 and 405mm.

  • Part AS010, double locking, 213mm of travel (Corbeau)
  • 291mm Retro / Sportline, 345mm Standard (its handle measures 320mm)
  • 370mm Motorsport L, 405mm Motorsport XL
  • Boxed pairs in 291mm, 345mm and 405mm

Sparco runners

This is the kit that leaves our door more than any other: steel rails, double locking, one kit per seat, at £41.94. Anything drilled on the 345mm pattern takes it, which by Sparco’s own listing means Corbeau and OMP base mount buckets and recliners as well as Sparco’s. The boxed pair is £78.00.

It is a base mount runner, so it will not go under a side mounted shell without side mounts and a frame in between, and Sparco do not list it as FIA approved. For a road car, a track day car or a rig neither of those comes up, and it is the kit Garreth fits as standard under a Sparco seat.

  • Part 0049306, steel, double locking
  • 345mm pattern, 271mm front to back
  • Fits Sparco, Corbeau and OMP base mount seats
  • Not FIA approved

OMP runners

OMP’s runner kit tells the same story: OMP’s 2026 catalogue gives the pattern as 345 x 270mm with M8 class 8.8 bolts, in steel and not FIA approved, and it suits their own subframes, seat mounts and Sparco seats. Each kit is the runner assemblies and the slide lever for one seat, at £50.40. The fixings are not in the box, so have the right bolts and washers on the bench before you start.

OMP also sell the RTS Seat Frame and Slider Kit (£120.00), the frame and slider made to go with OMP’s RTS seat. Ask us before you order it for a different seat.

  • Part HC0-0665, steel, not FIA approved (OMP)
  • 345 x 270mm pattern, M8 class 8.8 bolts
  • Suits OMP and Sparco seats
  • Runner assemblies and slide lever included, fixings not

Recaro runners

Recaro sell the double locking runner (part 364954) as a set, one set per seat, at £166.94, or £327.89 for two sets. Recaro’s 2024 list calls it a flat runner with the handle on the inside. Retailers give it as about 406mm wide, 2.5kg and 220mm of travel; Recaro do not print the dimensions themselves. It goes under Recaro seats at around 405mm across, and Recaro list it for motorsport seats up on side mounts at that width too.

The FIA Approved Sliding Seat Mount (£787.50) is a side mounting slider built for endurance racing, worked by a bar across the front so a driver can use it in gloves. Recaro make it in three versions: 7308864 for the P1300 GT (130mm of travel, 10.7kg), 7221002 for the Pro Racer SPA and SPG (6.9kg) and 7206293 for the XL shells (7.7kg), each with its own FIA homologation. Tell us the seat and we will confirm the version and its travel before you order.

  • Double locking runner, part 364954, one set per seat
  • About 406mm wide, 220mm of travel, 2.5kg (retailer figures)
  • FIA sliding mount: 7308864 (P1300 GT, 130mm), 7221002 (Pro Racer), 7206293 (Pro Racer XL)
  • Each FIA mount carries its own homologation

PCI Racing universal sliders

PCI build these for people who have already broken something lighter: heavier gauge steel, hardened steel roller balls and M8 grade 10.9 hardware, at £108.00 a seat. PCI print 245mm of travel, and the handle we measured in the showroom is 355mm across. The part that matters is underneath. PCI added mounting holes so each slider bolts down with four bolts, which stops it flexing when the seat is right forward or right back.

These are the ones we point at when the driver and seat together are heavy, or when a rig gets shared and shoved about by four different people. PCI also make slider side mounts in standard, narrow and wide, and six inch tall versions, covered in our tall and long side mounts guide.

  • 245mm of travel (PCI)
  • 355mm handle, measured in our showroom
  • Hardened roller balls, M8 grade 10.9 hardware
  • Four bolts per slider into the base

Endurance Motorsport runners

Endurance is our own line and fills the gaps the big brands leave. The standard sliding runner kit (£40.80) puts adjustment under a Sparco, Auto Style, OMP or Corbeau base mount seat on the 345mm pattern. All three Endurance kits move 213mm, the same as a Corbeau runner. Above the standard kit sit two premium kits: a Sparco compatible track day runner on 345mm (£90.00) for the common fitment built heavier, and a Recaro compatible kit on 405mm (£95.04) for the Recaro fitment at a lower price than Recaro’s own.

Endurance also make a weld in seat rail kit for cars with no mounting platform: two 560mm lengths of 25mm CDS tube, four M8 floating nut brackets and four load spreading plates, enough for one seat. It goes in first and the runner bolts on top afterwards.

  • Sliding runner kit, 345mm, fits Sparco, Auto Style, OMP and Corbeau base mounts
  • Sparco compatible premium track day runner, 345mm
  • Recaro compatible runner kit, 405mm
  • The standard kit is not FIA approved for competition use

Tillett runner sets

Tillett run their own system: their runners match Tillett seats and Tillett brackets, and Tillett print more about them than anybody else. The STRI and STRO are 24mm tall, 343mm long, 1.38kg and rated to 600kg. The PTRI and PTRO are 28mm tall, 380mm long and rated to 1100kg, with 130mm of travel forward and 120mm back, and all four Tillett runners move about 250mm. All of them use M8 fixings on holes 315mm front to back.

The I and O are about the brackets: the STRI (£166.69) and PTRI (£236.81) sit at 315mm across for brackets turned in under the seat, and the STRO (£169.34) and PTRO (£179.93) sit at 405mm across for brackets turned out, with a handle 90mm wider. The STRI suits the B2 and B4 on TB1 brackets, the B6 Screamer, B6 XL Screamer and B7 on TBF1 brackets, and a B5 on TB2 or TB3; the STRO, PTRO and PTRI suit the B5, B8 and B9. The TK5 kit (£22.80) puts the 14mm of spacers between seat and runner that Tillett ask for under a bottom mounted B6 or a W1. The W5 series has no bolt points for a slider, and Tillett list their runners for road cars, not race cars.

  • STRI and STRO: 24mm tall, 343mm long, 600kg rated (Tillett)
  • PTRI and PTRO: 28mm tall, 380mm long, 1100kg rated, 250mm of travel (Tillett)
  • I versions 315mm across, O versions 405mm with a 90mm wider handle
  • Road use only, per Tillett; W5 has no slider bolt points

Which runner goes under which seat

Cameron draws this table on the back of an invoice most weeks. Find your seat down the left and read across; green is a runner that bolts to it. Where a brand sells more than one width, the width you want is named, because the right part in the wrong width is the commonest mistake we see.

Your seatPatternCobraCorbeauSparco / OMP / Endurance 345Recaro / Endurance 405PCI
Cobra Clubman, Monaco, Daytona, Misano and Cobra recliners291 x 330Fits 291mmRetro / SportlineNoNoNo
Cobra motorsport seats on side mounts405 classFits 405mmMotorsport XLNoFitsFits
Corbeau Sportline and Classic291 x 330Fits 291mmRetro / SportlineNoNoNo
Corbeau Motorsport base mount345 x 271NoStandardFitsNoNo
Sparco base mount buckets and recliners345 x 271NoStandardFitsNoNo
OMP base mount buckets and recliners345 x 271NoStandardFitsNoNo
Recaro seatsabout 405 acrossNoMotorsport XLNoFitsFits
Motorsport shells on side mounts, standard width370 classNoMotorsport LNoNoFits
Wide track shells on side mounts405 classFits 405mmMotorsport XLNoFitsFits
Tillett seats take Tillett runnersThe B series matches Tillett's STRI, STRO, PTRO and PTRI through the TB brackets, and the W5 series has no slider bolt points. If you run a Tillett shell, work from the Tillett section above.

Every runner we sell, compared

The whole range side by side, with live prices including VAT. Where a maker does not publish a figure, the table says so. Each runner links to its listing.

RunnerBrandWidthPatternHeight addedTravelCoversPrice inc VAT
Cobra Seats Sliding RunnersCobra291 / 405mmCobra 292 x 33028mm (retailer)2mm1 seat£59.00
Cobra Premium Sliding RunnersCobra291 / 405mmCobra 292 x 33024.55mm2mm1 seat£84.00
2 Cobra 291 Seat Sliding RunnersCobra291mmCobra 292 x 33028mm (retailer)2mmpair£117.60
Cobra Nogaro Sliding Fitting KitCobra291mmCobra 292 x 330not published2mm1 seat£162.00
Corbeau Seat Sliding RunnersCorbeau291 / 345 / 370 / 405mmCobra or Sparco patternabout 26mm (estimate)213mm1 seat£58.80
2 Corbeau 291mm Seat Sliding RunnersCorbeau291mmCobra 292 x 330about 26mm (estimate)213mmpair£117.60
2 Corbeau 345mm Seat Sliding RunnersCorbeau345mmSparco 345 x 271about 26mm (estimate)213mmpair£117.60
2 Corbeau 405mm Seat Sliding RunnersCorbeau405mmRecaro 405 classabout 26mm (estimate)213mmpair£117.60
Sparco Seat Sliding Runner KitSparco345mmSparco 345 x 271about 26mm (estimate)not published1 seat£41.94
2 Sparco Seat Sliding Runner KitSparco345mmSparco 345 x 271about 26mm (estimate)not publishedpair£78.00
OMP Seat Slider And Runner KitOMP345mmOMP 345 x 270about 26mm (estimate)not published1 seat£50.40
OMP RTS Seat Frame and Slider KitOMP345mmSparco 345 x 271not publishednot published1 seat£120.00
Recaro Seats Double Locking Sliding RunnersRecaroabout 405mmRecaro, about 405 acrossabout 26mm (estimate)2mm (retailer)1 seat£166.94
2 Recaro Seats Double Locking Sliding RunnersRecaroabout 405mmRecaro, about 405 acrossabout 26mm (estimate)2mm (retailer)pair£327.89
Recaro FIA Approved Sliding Seat MountRecaroSide mountSide mountingnot published1mm1 seat£787.50
PCI Racing Universal Seat SlidersPCInot published (handle 355mm)Wide shells, 375 to 476mmabout 26mm (estimate)245mm1 seat£108.00
Endurance Motorsport Sliding Runner KitEndurance345mmSparco 345 x 271about 26mm (estimate)213mm1 seat£40.80
Endurance Sparco Compatible Premium Track Day RunnerEndurance345mmSparco 345 x 271about 26mm (estimate)213mm1 seat£90.00
Endurance Motorsport Recaro Compatible Runner KitEndurance405mmRecaro, about 405 acrossabout 26mm (estimate)213mm1 seat£95.04
Tillett STRI (FORMERLY TR1) Adjustable Seat Runner SetTillettTillettTillett 315 x 31524mm2mm1 seat£166.69
Tillett STRO (FORMERLY TR2) Adjustable Seat Runner SetTillettTillett, 90mm widerTillett 405 x 31524mm2mm1 seat£169.34
Tillett PTRO Adjustable Seat Runner SetTillettTillett, 90mm widerTillett 405 x 31528mm2mm1 seat£179.93
Tillett PTRI Adjustable Seat Runner SetTillettTillettTillett 315 x 31528mm2mm1 seat£236.81

Cars, rigs, boats and kit cars

Because there is no vehicle specific mounting in a runner, it does not care what is underneath it. All it wants is a flat, strong platform with two lines of holes at the right spacing. On a simulator rig it bolts straight to the profile seat rails, which is about the easiest fitment there is. In a boat it goes on a fabricated plate, and in a kit car or rebuild a weld in rail kit often goes in first.

Seat sliding runner rails lined up on a workshop bench with a tape measure running alongside them
Rails from three makers lined up against the tape.
The rule that carries across all of themThe runner answers to the seat, never to the vehicle. Once you know the seat's bolt pattern the runner is decided, and the only question left is what you bolt the pair of them to. See which seats work in a racing boat for the marine side.

Fitting them

  • Mounting first: a bracket on the factory points, a frame, or a drilled floor, torqued properly
  • Runner onto it, both rails flat and square, or it binds at the ends of its travel
  • Seat onto the runner last, then check the handle clears the door card and the tunnel
  • Run the full travel with your weight in the seat before you call it done
  • Check the seat belt buckle position, because a sport seat usually moves it
  • Several kits ship without fixings, so have bolts and washers ready

The last check is the one everybody skips. With the seat bolted down and your weight in it, slide it all the way forward and all the way back and watch what the handle does at each end. If it fouls the door card or the rear seat base, you want to know while the bolts are still easy to reach. Our bolt point tolerances guide covers lining everything up.

Which runner should you buy?

G

Garreth

Garreth's top tip

For most people the runner that matches the seat brand is the right answer. Sparco seat, Sparco kit. Cobra seat, Cobra Premium, because that is what Cobra build their subframes around.

When the seat and the bracket come from different places, Corbeau covers nearly everything with four widths at one price. If the car or rig is shared, or the driver and seat are heavy, the PCI sliders are what I would fit: four bolts per slider is a real answer to a real failure.

C

Cameron

Cameron's fitting view

Turn the seat over and give me the two measurements: across the front holes and front to back down one side. That tells me the pattern, and the pattern tells me the runner width. Everything else on this page follows from those two numbers.

Before anything is tightened for good, I run the seat through its full travel with someone sat in it, and check the handle, the door card and the belt buckle at both ends. Send me the car and the seat and I will match the bracket and the runner.

Common questions about sliding runners

Yes, as long as the floor is flat and strong there and you drill it to the holes in the runner, because they will not line up with the factory seat points on their own. Most people bolt the runner to a vehicle bracket such as a Planted bracket, which uses the factory points for you.

No. It is the width the tracks are set at, which matches the seat’s bolt spacing; the handle between them measures a little less, 320mm on Corbeau’s 345mm Standard runner. Where makers print travel it runs from 130mm to 250mm, whatever the width.

On the makers’ own figures, 24mm to 28mm. Cobra’s drawings give 24.55mm for the Premium runner, and Tillett print 24mm for the STRI and STRO and 28mm for the PTRI and PTRO. The rest, PCI, Recaro, Corbeau, Endurance, Sparco and OMP, add about 26mm by our estimate.

Almost every listing is per seat, so two seats need two kits. The boxed pairs say pair in the name.

No. Cobra drill 291 x 330mm and Sparco 345 x 271mm, and neither dimension matches. Recaro are wider again at about 405mm across. Corbeau are the way round it, because they drill for both the Cobra and Sparco patterns and sell runners in four widths.

The Sparco and Endurance kits are not listed as FIA approved. The Recaro FIA Approved Sliding Seat Mount is the one that carries an approval: each of its three versions has its own homologation for the seat it is made for.

Yes. The rig’s seat rails do the bracket’s job, so the runner bolts straight onto them. Match the runner to the seat’s bolt pattern as usual.

The Recaro runner (£166.94) is a double locking set on the wider Recaro fitment, about 2.5kg, with 220mm of travel on retailer figures. The Sparco kit (£41.94) suits the 345mm pattern. They go under different seats, so the seat decides first.

Measure between the centres of the two front bolt holes, then front to back down one side, and send us those numbers with the make and model. Bring it in and Cameron will put a tape on it with you.

Halfway through a conversion?

Send us the car and a photo of the underside of the seat, or ring Garreth and Cameron. Cally, our digital receptionist, takes your details, and we come back with the bracket and the runner. You are very welcome to bring the seat into the showroom and put a tape on it with us.

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