A sliding runner is the least interesting part of a seat conversion and the one that decides whether you can live with it. Bolt a bucket straight to a bracket and it is fixed where you put it, which is fine for one driver in a car that only sees track days. Put runners in between and the same seat moves fore and aft on a handle, so a second driver can get in it, so the pedals suit whoever is sat there, and so you can slide it forward to get to something behind it.
We stock runners from Cobra, Corbeau, Sparco, OMP, Recaro, PCI Racing, Sabelt, Endurance Motorsport and Tillett. They all do the same job, they all raise the seat by about the same amount, and the thing that separates them is a single measurement in the product name. This page explains that measurement, gives you the bolt patterns behind it, and lists every runner we sell against the seats it goes under. Working out those combinations is what I do here. I am Cameron, and this is the page I would talk you through on the counter.
What is on this page
A runner is a pair of steel rails with a locking mechanism and a release handle across the front. The lower rail bolts down to whatever is underneath. The upper rail bolts up to the seat. Lift the handle and the seat slides, let go and it locks. That is the whole device, and it has barely changed in thirty years because it does not need to.
Where people go wrong is what sits underneath. A runner has no vehicle specific mounting in it at all. The holes in the bottom rail are the manufacturer’s own, not your car’s, so a runner cannot bolt to a standard floor on its own. It needs a bracket or a subframe below it, and that part is the one that is cut for your car. Buy a runner expecting it to solve the fitment and you have bought half a kit.
Fore and aft movement of around 200mm on a handle, with a locking mechanism at each position. Cobra publish 200mm on theirs and Recaro publish 220mm on the double locking version. Most of the others do not publish a figure, and in practice they are all in the same territory.
Runners are universal, which means they are not cut for any car. Underneath one you need a vehicle specific bracket, subframe or side mount. Above one you need a seat drilled to the matching pattern.
Almost every listing on our site is priced per seat, which means one left rail and one right rail with the handle between them. A pair of seats needs two kits. We also sell several of them boxed as pairs to save you doing the maths.
Nearly every runner we sell has a millimetre figure attached to it. Corbeau list four options, Cobra list two, and the rest are built to one size and do not bother saying so on the box. That figure is the width of the handle, and by extension the distance between the two rails. It is not the length of the rail and it is not how far the seat travels.
This one catches people out constantly, because the numbers look like lengths. They are not. The two rails sit under the seat at its bolt spacing, and the handle has to span between them, so the handle width is really the seat’s mounting width wearing a different name. Pick it to match the seat, not to get more movement, because all of them move about the same distance.
Underneath a base mount seat there are four bolt holes, and across the whole aftermarket there are really only two arrangements of them. Cobra drill theirs at 291mm across by 330mm front to back. Sparco drill theirs at 345mm across by 271mm front to back, and OMP, Sabelt and a lot of others followed them. The two do not line up in either direction, which is why a Cobra runner will not go under a Sparco seat and the other way round.
Corbeau are the useful exception. They drill their recliners for both patterns, so a Corbeau seat opens up every route, and they sell runners in four handle widths to suit whatever ends up on top. Wide track motorsport shells on side mounts sit further apart again, which is where the 370mm and 405mm options come in.
| Pattern | Across | Front to back | Seats drilled for it | Runner to order |
|---|---|---|---|---|
| Cobra | 291mm | 330mm | Cobra Clubman, Monaco, Daytona, Misano and the rest of the Cobra recliners. Corbeau Sportline and Classic. | Cobra runners, or Corbeau in the Retro / Sportline width |
| Sparco | 345mm | 271mm | Sparco base mount buckets and recliners, OMP base mounts, Sabelt aftermarket base mounts, Corbeau Standard. | Sparco, OMP, Sabelt, Endurance, or Corbeau in the Standard width |
| Wide, side mounted | 370 to 405mm | Set by the side mount | Motorsport shells on side mounts, Cobra motorsport seats, Recaro base mount seats. | Recaro, or Corbeau in the L or XL width |
A runner sits between the bracket and the seat, so it adds its own thickness to your final seat height. That thickness is about 25mm, an inch in old money, and it is close enough to the same figure across every brand on this page that you can treat it as a constant when you are planning a build. It is one of the few numbers in seat fitting that does not change with the car.
Whether that 25mm matters depends on the roof. In a saloon it disappears. In a low car with a helmet on, or in anything where you were already scraping the headlining, it is the difference between comfortable and not. That is the honest trade for the adjustment, and it is worth deciding on before you order rather than after the seat is in. Our guide to seat height and fitment works through the whole stack, and the tall and long side mount guide covers what happens above it.
Cobra keep it simple. One runner design, two handle widths, and both of them are made to 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 replaced it as the default on Cobra subframe applications in 2020, and it is the one Cobra now expect you to be using with their vehicle specific kits.
The choice between the two widths is about the seat, not the price. The 291mm handle covers the Clubman and Monaco buckets and every Cobra reclining seat, which includes the Daytona and the Misano. The 405mm handle is for Cobra’s motorsport seats when they are on side mounts, and for the base mount recliners where the wider handle suits the shell. Cobra publish 200mm of slide travel on the standard runner. If you are buying a Cobra vehicle fitting kit, you need the runner alongside it, not instead of it.
Corbeau give you the most choice of anyone, and it is the range I reach for when a customer has a seat from one brand and a bracket from another. One runner design, four handle widths, same price whichever you pick, which tells you straight away that the widths are about fit rather than specification. Corbeau describe them as suitable across their own range, and in practice they cover a good deal of what other people make too.
The Retro / Sportline option at 291mm suits Corbeau’s classic seats and anything on the Cobra pattern. The Standard option at 345mm is the one that opens up Sparco and OMP base mounts as well as Corbeau’s own. The L at 370mm and the XL at 405mm are for side mounted motorsport shells, with the XL also being the size for Recaro seats and wide track shells. They are a favourite with kit car builders for exactly that reason: one part number, four ways to make a seat meet a floor.
The Sparco kit is the one we sell most of, and it is the cheapest way to put adjustment under a base mount seat. Steel rails, double locking, one kit per seat, and it fits a good deal more than Sparco seats. Anything drilled on the 345mm pattern will take it, which by Sparco’s own listing means Corbeau and OMP base mount buckets and recliners as well as their own.
Two things to know before you order. It is a base mount runner only, so it will not go under a side mounted shell without side mounts and a frame in between, and it is not FIA approved, which rules it out of competition where the regulations call for a homologated mounting. For a road car, a track day car or a rig, none of that matters. If you want the same fitment built heavier, Endurance make a premium track day version on the same 345mm width.
OMP’s runner kit is the same 345mm story as the Sparco, and OMP say so themselves: it suits their own subframes and seat mounts, and it works with Sparco seats too. Each kit comes as the runner assemblies plus the slide lever, one kit per seat. Hardware is not in the box, which is worth knowing before you start, because you will want the right length bolts and washers to hand rather than halfway through the job.
OMP also do something none of the others do. The RTS Seat Frame and Slider Kit is a frame and a slider sold together as one part, 380mm long, six mounting holes, 3mm steel in a low profile. If you are working to a tight height it is worth a look, because it replaces two items in the stack with one.
Recaro sit at the top of this page on price and on engineering. The double locking runner is the one most people want, made to go under Recaro base mount seats, and Recaro publish 220mm of travel on it. It is also the runner that covers the widest seats we sell: Recaro list it as suitable for Corbeau, Cobra, Sparco and OMP motorsport seats on side mounts, at an estimated 405mm width. It is a heavy, solid thing, and picking one up next to a £42 kit tells you where the money went.
Two others in the range are worth separating out, because one of them is not universal at all. The Manual Tracking runner is a specialist part that only works with Recaro’s own fitting kits for a listed set of cars, so do not order it as a general purpose slider. The FIA Approved Sliding Seat Mount is a different animal again: a side mounting slider built for endurance racing, released by a bar at the front so you can work it in race gloves, with 160mm of adjustment on the Pro Racer SPA and SPG and 130mm on the P1300GT. If you want the Recaro fitment without the Recaro invoice, Endurance make a compatible 405mm kit.
PCI build these for people who have broken something cheaper. Heavier gauge steel than a standard runner, hardened steel roller balls instead of the usual arrangement, and a 355mm release handle. The detail that matters is at the bottom: PCI added extra mounting holes so each slider bolts down with four bolts rather than two, which is what stops a slider flexing when the seat is right forward or right back and the load is nowhere near the middle.
That is a genuine engineering answer to a genuine problem, and it is why these are the ones I point at when somebody is running a heavy driver, a heavy seat, or both, or when a rig gets used hard by more than one person. They come as a handle and two rails to attach the seat to the base, sold per seat, and PCI publish the build detail themselves. PCI also make a set of slider side mounts in standard and narrow / wide, in normal and six inch tall, if you need the slider and the side mounting to come from one place.
Sabelt’s kit is another 345mm runner, and Sabelt list it as fitting their own aftermarket base mount seats along with Sparco, Corbeau and OMP. Same one kit per seat, same base mount only restriction, same note about it not being FIA approved. If you already run Sabelt harnesses and want the badge to match, this is the one.
One trap on this listing that is worth reading twice. It works with Sabelt’s aftermarket seats, not with the OEM Sabelt seats that came factory fitted in cars like the Fiat 500 Abarth. Those are a different mounting altogether, and people do get caught by the shared brand name.
Endurance is our own line, and it exists to fill the gaps the brands leave. The standard sliding runner kit is the cheapest way on this page to get adjustment under a Sparco, Auto Style, OMP or Corbeau base mount seat, on the same 345mm pattern as everything else in that family. Above it sit two premium kits: a Sparco compatible track day runner on 345mm, and a Recaro compatible kit on 405mm for people who want the Recaro fitment without the Recaro price.
Two more parts in the range are not runners at all but solve the problem next door. The weld in seat rail kit is a mounting platform for cars that do not have one, two 560mm lengths of 25mm CDS tube with four M8 floating nut brackets and four load spreading plates, enough for one seat. It is an Escort favourite and it works anywhere you can get a welder to the sills and tunnel. The base mount adapter bar lets M2 and Driftworks rails carry a Corbeau, OMP or Sparco base mount seat, which saves buying a whole second fitting kit.
Tillett run their own world and it is worth understanding before you order, because their runners are matched to Tillett seats and brackets rather than to a bolt pattern shared with anyone else. The STRI, formerly the TR1, is the workhorse: double locking, with 250mm of leg length adjustment, and it goes under the B2 and B4 on TB1 brackets, under the TBF1 brackets with the B6 Screamer, B6 XL Screamer and B7, and under a B5 on TB2 or TB3 brackets turned under the seat for a narrow footprint.
The STRO, formerly the TR2, covers the B5, B8 and B9. The PTRO and PTRI are the newer pair for the B8 and B9. If you want to bolt the STRI straight to the bottom of a bottom mounted B6 or a W1 with no brackets between, you need the TK5 kit, which is the extra spacers that make it sit right. The W5 series has no bolt points for sliding components at all, so there is no runner route on those.
This is the table I would draw on the back of an invoice if you rang up and asked. Find your seat down the left, read across, and the green cells are the runners that bolt to it. Where a brand offers more than one handle width the width you need is named in the cell, because ordering the right part number in the wrong width is the single most common way this goes wrong.
| Your seat | Pattern | Cobra | Corbeau | Sparco / OMP / Sabelt / Endurance | Recaro | PCI |
|---|---|---|---|---|---|---|
| Cobra Clubman, Monaco, Daytona, Misano and Cobra recliners | 291 x 330 | Fits 291mm | Fits Retro / Sportline | No | No | No |
| Cobra motorsport seats on side mounts | 405 class | Fits 405mm | Fits Motorsport XL | No | Fits | Fits |
| Corbeau Sportline and Classic | 291 x 330 | Fits 291mm | Fits Retro / Sportline | No | No | No |
| Corbeau Motorsport base mount | 345 x 271 | No | Fits Standard | Fits | No | No |
| Sparco base mount buckets and recliners | 345 x 271 | No | Fits Standard | Fits | No | No |
| OMP base mount buckets and recliners | 345 x 271 | No | Fits Standard | Fits | No | No |
| Sabelt aftermarket base mount | 345 x 271 | No | Fits Standard | Fits | No | No |
| Recaro base mount seats | 405 class | No | Fits Motorsport XL | No | Fits | Fits |
| Motorsport shells on side mounts, standard width | 370 class | No | Fits Motorsport L | No | No | Fits |
| Wide track shells on side mounts | 405 class | Fits 405mm | Fits Motorsport XL | No | Fits | Fits |
| Tillett B series | Tillett | No | No | No | No | No |
Where a cell says no, it is because the holes do not line up, not because the part is unavailable. If your seat is not on this list, measure the two dimensions off the underside and send them over. That is a two minute job at your end and it saves a return at ours.
All twenty five listings in the range, in one place. Prices include VAT and were correct on 5 August 2026. Where a column says the manufacturer does not publish a figure, we have left it out rather than estimate it.
| Product | Brand | Handle width | Covers | Price inc VAT | Notes |
|---|---|---|---|---|---|
| Sparco Seat Sliding Runner Kit | Sparco | 345mm | 1 seat | £41.94 | The volume seller. Base mount only, not FIA approved |
| Endurance Motorsport Sliding Runner Kit | Endurance | 345mm | 1 seat | £40.80 | Cheapest route to adjustment on the 345mm pattern |
| OMP Seat Slider And Runner Kit | OMP | 345mm | 1 seat | £50.40 | Fixings not included |
| Sabelt Seat Sliding Runner Kit | Sabelt | 345mm | 1 seat | £51.00 | Aftermarket Sabelt seats only, not OEM |
| Corbeau Seat Sliding Runners | Corbeau | 291 / 345 / 370 / 405mm | 1 seat | £58.80 | Four handle widths at one price |
| Cobra Seats Sliding Runners | Cobra | 291 / 405mm | 1 seat | £59.00 | 200mm of travel, Cobra base mount seats |
| 2 Sparco Seat Sliding Runner Kit | Sparco | 345mm | 2 seats | £78.00 | Boxed pair |
| Cobra Premium Sliding Runners | Cobra | 291 / 405mm | 1 seat | £84.00 | The current standard for Cobra subframe applications |
| Endurance Sparco Compatible Premium Track Day Runner | Endurance | 345mm | 1 seat | £90.00 | Heavier build on the Sparco fitment |
| Endurance Motorsport Recaro Compatible Runner Kit | Endurance | 405mm | 1 seat | £95.04 | Recaro fitment without the Recaro price |
| PCI Racing Universal Seat Sliders | PCI Racing | 355mm | 1 seat | £108.00 | Four base bolts per slider, hardened roller balls |
| 2 Cobra 291 Seat Sliding Runners | Cobra | 291mm | 2 seats | £117.60 | Boxed pair |
| 2 Corbeau 291mm Seat Sliding Runners | Corbeau | 291mm | 2 seats | £117.60 | Boxed pair |
| 2 Corbeau 345mm Seat Sliding Runners | Corbeau | 345mm | 2 seats | £117.60 | Boxed pair |
| 2 Corbeau 405mm Seat Sliding Runners | Corbeau | 405mm | 2 seats | £117.60 | Boxed pair |
| OMP RTS Seat Frame and Slider Kit | OMP | 345mm | 1 seat | £120.00 | Frame and slider in one, 380mm long, 3mm steel, low profile |
| Cobra Nogaro Sliding Fitting Kit | Cobra | 291mm | 1 seat | £162.00 | Complete sliding fitting kit for the Nogaro |
| Tillett STRI, formerly TR1 | Tillett | Tillett | 1 seat | £166.69 | Double locking, 250mm of leg length adjustment |
| Recaro Seats Double Locking Sliding Runners | Recaro | 405mm | 1 seat | £166.94 | 220mm of travel |
| Tillett STRO, formerly TR2 | Tillett | Tillett | 1 seat | £169.34 | For the B5, B8 and B9 |
| Tillett PTRO Adjustable Seat Runner Set | Tillett | Tillett | 1 seat | £179.93 | For the B8 and B9 |
| Recaro Manual Tracking Sliding Runner | Recaro | Recaro kits | 1 seat | £210.00 | Not universal. Only with Recaro listed vehicle fitting kits |
| Tillett PTRI Adjustable Seat Runner Set | Tillett | Tillett | 1 seat | £236.81 | For the B8 and B9 |
| 2 Recaro Seats Double Locking Sliding Runners | Recaro | 405mm | 2 seats | £365.40 | Boxed pair |
| Recaro FIA Approved Sliding Seat Mount | Recaro | Side mount | 1 seat | £787.50 | FIA approved. 160mm on Pro Racer SPA and SPG, 130mm on P1300GT |
The TK5 fitting kit at £22.80 inc VAT sits alongside these as the spacer set that lets a Tillett STRI bolt straight under a bottom mounted B6 or a W1. The Endurance weld in seat rail kit at £108.00 and the base mount adapter for M2 rails at £47.40 are in the same category, useful next to a runner rather than instead of one. You can see the whole lot on the sliding runners category page, where stock is live.
Because a runner has no vehicle specific mounting in it, it does not care what is underneath. All it needs is a flat platform with two lines of bolt holes at the right spacing, and after that it is a seat that moves. That is why the same part turns up in jobs that look nothing like each other.
In a car it goes on top of a vehicle bracket or subframe. On a simulator rig it bolts straight to the aluminium profile seat rails, which is about the easiest fitment there is, and it is what lets two people share a rig without either of them settling for the wrong pedal distance. In a boat it goes on a fabricated mounting plate. In a kit car or a rebuild there may be no platform at all yet, which is where a weld in rail kit comes in first and the runner goes on top of it afterwards.
The rule that carries across all of them is that the runner answers to the seat and not to the vehicle. Once you know the seat’s bolt pattern, the runner choice is settled, and the only question left is what you are bolting the pair of them down to. On a car that is a bracket we can look up. On a rig it is already there. On a boat or a bare shell it is something you or a fabricator make, and the runner does not much care which, as long as it is flat, strong and drilled square.
Runner on top of a vehicle specific bracket or subframe, seat on top of that. Check the seat belt buckle clearance once it is in, because a sport seat often puts the buckle somewhere new.
Bolts straight to the rig's seat rails. The 345mm kits suit most sim seats, and PCI's four bolt base is the one for a rig that gets shared and moved about.
The same platform logic on a fabricated plate. We have written up which seats work in a racing boat, and the runner choice follows the seat exactly as it does in a car.
Where there is no factory mounting to work from, the Endurance weld in rail kit creates one. Corbeau's four handle widths are popular here because one part number covers most of what people end up fitting.
The job itself is straightforward once the parts are right, and the order matters more than the technique.
Bracket to the floor first, on the factory seat mounting points, torqued properly. Runner onto the bracket next, both sides sat flat and square to each other, because a runner that is twisted will bind at one end of its travel and you will feel it every time you move the seat. Seat onto the runner last. Then before you drive it, sit in it, run the seat through its full travel with your weight in it, and check that the seat belt buckle still comes to hand and is not fouled by the seat edge.
Two details worth having ready. Several of these kits ship without fixings, so have the right length bolts and washers on the bench rather than discovering it halfway through. And if you have bought a vehicle specific fitting kit from Cobra, the runner is a separate item that goes with it, not an alternative to it.
The last check is the one people skip. 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 catches the door card at the front or the rear seat base behind, you want to know now, while the bolts are still easy to reach.
No. A runner has no vehicle specific mounting in it, so the holes in the bottom rail will not line up with your floor. It needs a bracket or subframe cut for your car underneath it. The runner and the bracket are two separate purchases and you need both.
No, it is the handle width and it tells you which seat the runner goes under. Travel is around 200mm across the range, and the widths exist because seats are drilled at different spacings, not because one moves further than another.
About 25mm, and that figure holds near enough across every brand on this page. Add it to your bracket height and your seat height when you are working out headroom. Our seat height and fitment guide works through the whole stack.
Almost every listing is priced per seat, so a pair of seats needs two kits. Several are also sold boxed as a pair, and those listings say so in the product name. Check which one you are looking at before you check out.
No. Cobra base mounts are drilled at 291mm by 330mm and Sparco at 345mm by 271mm, and neither dimension matches. Corbeau are the way round it, because they drill for both patterns and sell runners in four handle widths.
The Sparco, Sabelt and Endurance kits are listed as not FIA approved for competition use. The Recaro FIA Approved Sliding Seat Mount is the one on this page that carries an approval, and it is a side mounting slider built for endurance racing. If your class requires a homologated mounting, check the regulations for your championship before ordering.
Yes, and it is one of the easiest fitments there is. The rig's seat rails do the job the bracket does in a car, so the runner bolts straight to them. Match the runner to the seat's bolt pattern in the usual way.
Turn it over and measure between the centres of the two front bolt holes, then from the front hole to the back hole down one side. Send us those two numbers with the make and model and we will tell you which runner fits.
For most people, the runner that matches the seat brand is the right answer and there is nothing clever to add. Sparco seat, Sparco kit at £41.94. Cobra seat, Cobra Premium runner, because it is what Cobra now build their subframes around.
Corbeau is the one I reach for when the seat and the bracket come from different places, because four handle widths at one price covers nearly everything and it keeps the options open while you are still deciding. If the car or the rig gets shared, or the driver and seat together are heavy, spend the extra on the PCI. Four bolts per slider into the base is a real answer to a real failure, not a spec sheet line.
Runners are the cheapest part of a seat conversion and the one that most changes how you get on with it day to day. They are also the part people order last, in a hurry, in the wrong width. Measure the seat, pick the width, buy the bracket to go under it, and the job comes together in an evening.
If you are partway through a conversion and not sure what you have, send us a photo of the underside of the seat and the car it is going in. We have been doing this since 2003 and we would far rather sort it out before the parcel leaves than after.
Every universal seat sliding runner we sell, with the handle widths, the two bolt patterns behind them, the 25mm they add to your seat height, and which seats each one goes under.
The five reclining sport seats we rate for the air-cooled Porsche 911, 1966 to 1998, with the Cobra, Sparco and Planted Technology frame routes split by build year.
The original Sim-Lab P1X gives you two 40×40 rails and no seat bracket. Sim-Lab publishes a rail spacing for seven seats, four of them Sparco. Here is which seat fits, and the 290mm pattern that never changes.
Every Safety Devices roll cage we hold for the Rover Metro, Metro R6, 200 and 216 GTI and Rover 25, with part numbers, prices and the approval each one is listed under.
Corsa VXR seats sit on the 405mm Recaro bolt pattern, which is what makes them worth moving into an Astra H. Here is the frame that takes them, the runners that match, and what the whole job costs.
Sparco Evo QRT, Evo L QRT or Evo XL QRT? Compare shoulder width, hip room, seat depth and weight using Sparco’s own dimensions, with all three on display at GSM Performance.
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