Cobra pattern
292mm x 330mm, between bolt centres
- Across
- 292mm
- Front to back
- 330mm
- Seats
- Cobra base mount seats and recliners, Corbeau Sportline and Classic.
Call Garreth, Cameron & Jack: 0115 647 8650
FREE UK shipping on orders over £100.00 & FREE gifts on checkout
Talk to us
Call Garreth, Cameron, Jack
Today On: 0115 647 8650
Click Here For Our Contact Form
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.

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.
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.
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.

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.
292mm x 330mm, between bolt centres
345mm x 271mm, between bolt centres
315mm x 315mm, between bolt centres
405mm x 315mm, between bolt centres
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.
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 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.
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.
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.
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.
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.
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.
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.
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.
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 seat | Pattern | Cobra | Corbeau | Sparco / OMP / Endurance 345 | Recaro / Endurance 405 | PCI |
|---|---|---|---|---|---|---|
| Cobra Clubman, Monaco, Daytona, Misano and Cobra recliners | 291 x 330 | Fits 291mm | Retro / Sportline | No | No | No |
| Cobra motorsport seats on side mounts | 405 class | Fits 405mm | Motorsport XL | No | Fits | Fits |
| Corbeau Sportline and Classic | 291 x 330 | Fits 291mm | Retro / Sportline | No | No | No |
| Corbeau Motorsport base mount | 345 x 271 | No | Standard | Fits | No | No |
| Sparco base mount buckets and recliners | 345 x 271 | No | Standard | Fits | No | No |
| OMP base mount buckets and recliners | 345 x 271 | No | Standard | Fits | No | No |
| Recaro seats | about 405 across | No | Motorsport XL | No | Fits | Fits |
| Motorsport shells on side mounts, standard width | 370 class | No | Motorsport L | No | No | Fits |
| Wide track shells on side mounts | 405 class | Fits 405mm | Motorsport XL | No | Fits | Fits |
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.
| Runner | Brand | Width | Pattern | Height added | Travel | Covers | Price inc VAT |
|---|---|---|---|---|---|---|---|
| Cobra Seats Sliding Runners | Cobra | 291 / 405mm | Cobra 292 x 330 | 28mm (retailer) | 2mm | 1 seat | £59.00 |
| Cobra Premium Sliding Runners | Cobra | 291 / 405mm | Cobra 292 x 330 | 24.55mm | 2mm | 1 seat | £84.00 |
| 2 Cobra 291 Seat Sliding Runners | Cobra | 291mm | Cobra 292 x 330 | 28mm (retailer) | 2mm | pair | £117.60 |
| Cobra Nogaro Sliding Fitting Kit | Cobra | 291mm | Cobra 292 x 330 | not published | 2mm | 1 seat | £162.00 |
| Corbeau Seat Sliding Runners | Corbeau | 291 / 345 / 370 / 405mm | Cobra or Sparco pattern | about 26mm (estimate) | 213mm | 1 seat | £58.80 |
| 2 Corbeau 291mm Seat Sliding Runners | Corbeau | 291mm | Cobra 292 x 330 | about 26mm (estimate) | 213mm | pair | £117.60 |
| 2 Corbeau 345mm Seat Sliding Runners | Corbeau | 345mm | Sparco 345 x 271 | about 26mm (estimate) | 213mm | pair | £117.60 |
| 2 Corbeau 405mm Seat Sliding Runners | Corbeau | 405mm | Recaro 405 class | about 26mm (estimate) | 213mm | pair | £117.60 |
| Sparco Seat Sliding Runner Kit | Sparco | 345mm | Sparco 345 x 271 | about 26mm (estimate) | not published | 1 seat | £41.94 |
| 2 Sparco Seat Sliding Runner Kit | Sparco | 345mm | Sparco 345 x 271 | about 26mm (estimate) | not published | pair | £78.00 |
| OMP Seat Slider And Runner Kit | OMP | 345mm | OMP 345 x 270 | about 26mm (estimate) | not published | 1 seat | £50.40 |
| OMP RTS Seat Frame and Slider Kit | OMP | 345mm | Sparco 345 x 271 | not published | not published | 1 seat | £120.00 |
| Recaro Seats Double Locking Sliding Runners | Recaro | about 405mm | Recaro, about 405 across | about 26mm (estimate) | 2mm (retailer) | 1 seat | £166.94 |
| 2 Recaro Seats Double Locking Sliding Runners | Recaro | about 405mm | Recaro, about 405 across | about 26mm (estimate) | 2mm (retailer) | pair | £327.89 |
| Recaro FIA Approved Sliding Seat Mount | Recaro | Side mount | Side mounting | not published | 1mm | 1 seat | £787.50 |
| PCI Racing Universal Seat Sliders | PCI | not published (handle 355mm) | Wide shells, 375 to 476mm | about 26mm (estimate) | 245mm | 1 seat | £108.00 |
| Endurance Motorsport Sliding Runner Kit | Endurance | 345mm | Sparco 345 x 271 | about 26mm (estimate) | 213mm | 1 seat | £40.80 |
| Endurance Sparco Compatible Premium Track Day Runner | Endurance | 345mm | Sparco 345 x 271 | about 26mm (estimate) | 213mm | 1 seat | £90.00 |
| Endurance Motorsport Recaro Compatible Runner Kit | Endurance | 405mm | Recaro, about 405 across | about 26mm (estimate) | 213mm | 1 seat | £95.04 |
| Tillett STRI (FORMERLY TR1) Adjustable Seat Runner Set | Tillett | Tillett | Tillett 315 x 315 | 24mm | 2mm | 1 seat | £166.69 |
| Tillett STRO (FORMERLY TR2) Adjustable Seat Runner Set | Tillett | Tillett, 90mm wider | Tillett 405 x 315 | 24mm | 2mm | 1 seat | £169.34 |
| Tillett PTRO Adjustable Seat Runner Set | Tillett | Tillett, 90mm wider | Tillett 405 x 315 | 28mm | 2mm | 1 seat | £179.93 |
| Tillett PTRI Adjustable Seat Runner Set | Tillett | Tillett | Tillett 315 x 315 | 28mm | 2mm | 1 seat | £236.81 |
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.

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.
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.
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.
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.
On all orders above £100
Try before you buy, by appointment
Updates by email and text
Not sure what fits, which approval you need, or what to choose next? Ask Garreth and Cameron. You’ll get a practical answer from people who handle the kit every day.
