Dax Rush bucket seat guide
Kit car, all years
The Dax Rush is a kit car. The cockpit dimensions are set by the steel spaceframe before the GRP bodywork goes on, and the seat has to work within that space, not the other way around. Most builders sort the seat at the build stage, while there is still full access to the floor and chassis rails, rather than trying to fit one after the body is on. There are no off-the-shelf seat sub-frames for the Rush: the mounting bracket is custom-fabricated, either to the factory floor points or direct to the chassis rails depending on how the build is set up.
Because the interior is so compact, most standard competition shells are simply too wide to clear the chassis tubes without modification. The Cobra Roadster 7 at 400mm wide has been fitted to enough Rush builds by our customers to give us a clear recommendation. This guide is built around what we have actually seen installed rather than what the spec sheet might suggest could fit.
- No off-the-shelf seat sub-frames for the Dax Rush. The mounting bracket is custom-fabricated to the chassis rails or existing floor points
- The Cobra Roadster 7 is 400mm wide, 745mm high, and 790mm deep and weighs 8.8kg. It has been proven to fit the Rush cockpit across multiple real customer builds
- All Cobra Roadster 7 variants use a 291mm base mount bolt pattern. Sorting the seat at the build stage gives full access to fabricate the bracket correctly
- The Sport Turbo variants have harness slots cut into the seat back. Standard and Signature versions are solid-back
- For harnesses, shoulder strap mounting points need to be behind the seat at roughly shoulder height. A roll cage or harness bar provides this. The factory Rush chassis has nothing suitable at that point
- The Schroth Caterham II pair is designed for the same category of open-cockpit seven-style car and is worth considering alongside the Willans options
What is on this page
Mounting
The Dax Rush has no manufacturer-specific seat sub-frame listed anywhere in the catalogue. This is common across seven-style kit cars: the chassis geometry varies enough between builds that bracket options are rarely economical to produce. The bracket is fabricated by the builder or a local fabricator, usually from RHS or angle steel, either picking up the original floor mounting points or going direct to the chassis rails.
Cobra seats use a 291mm base mount bolt pattern. If you are fabricating a bracket, that is the measurement to work to for the Roadster 7 range. Sparco, OMP and Corbeau base mount seats share the 345mm x 271mm pattern if you want a different brand, though we have more fitting experience with the Cobra on this car specifically.
Sort the bracket at the build stage if at all possible. Access to the floor and chassis rails with the body off is far cleaner than threading a bracket into a finished car. Build with the seat you intend to run long-term, not a placeholder.
No frame to order, just a bracket to fabricateThere is no off-the-shelf bracket for the Dax Rush. Any competent fabricator can build one to the Cobra 291mm or Sparco 345mm x 271mm pattern. If you want to talk through the best approach for your specific build, call or email us and we will run through it.
Bucket seats
The Cobra Roadster 7 is the seat that fits. It was designed for seven-style vehicles where interior space is limited, with the seat back shaped to use the angle of the rear bulkhead rather than taking up extra legroom. At 400mm wide and 8.8kg it clears the Rush chassis tubes in the builds we have seen installed. All variants are base mount only on the 291mm Cobra pattern.
The standard Roadster 7 at 474 pounds is available in black vinyl, black leather facings with vinyl back, or black spacer fabric. The Signature version at 533 pounds adds a custom trim choice with colour piping options. Both are solid-back seats.
The Sport versions add harness slots. The Roadster 7 Sport Signature at 599 pounds is the trimmed option. The Sport Turbo Narrow Fit at 619 pounds and Sport Turbo Signature at 653 pounds are the top of the range: harness slots, more aggressive shaping, the same narrow-fit dimensions as the standard version. If a harness is going in, the Sport Turbo variants save cutting the seat yourself later.
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Our picks, not the whole listWhich Roadster 7 for your Rush
For a car that does road and track miles, the standard Roadster 7 at 474 pounds is the practical choice: proven in the Rush cockpit, black vinyl or leather trim options, solid back. For a car going onto the track with a harness, the Sport Turbo Narrow Fit at 619 pounds has the harness slots already cut and is the sensible step up. If you want the premium trim and are not sure which version to order, tell us what the car is being used for and what harness setup you are planning. Cameron works out the right combination for the build.
Harnesses
The Rush needs harness mounting points behind the seat at roughly shoulder height. The factory chassis does not have anything at that point, so a roll cage or a dedicated harness bar needs to be part of the build plan before you order a harness. This is worth sorting before the seat goes in.
The Willans Silverstone 4×4 EXG at 235 pounds is a FIA 8853-1998 rated 4-point belt with an aircraft buckle. The wrap-around end fittings make it one of the easier harnesses to fit on a custom-built car where the mounting points may not match a standard installation. Available as a single belt or as a pair at 584 pounds for two.
The Schroth Caterham II 4-point pair at 578 pounds is designed for the Caterham, which runs a very similar open-cockpit setup to the Rush. FIA 8854-1998, ASM anti-submarining geometry, two belts in the box. If the car is being built as a pair (driver and passenger both wearing harnesses), the pair products work out around 25 pounds a side cheaper than buying individual belts.
The single Schroth Lotus II ASM at 341 pounds and Lotus II-FE at 421 pounds carry Lotus-specific bolt-in hardware at the lap strap attachment points. That hardware was designed for the Elise and Exige floor mounting geometry. On a Dax Rush with a custom bracket, the attachment method will need to match your actual mounting points. Worth checking before you order if you are not wrapping the belt around a bar or frame member.
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Our recommendationsSort the mounting point before the belt
The Willans Silverstone at 235 pounds is the most flexible option on a custom-built car: aircraft buckle, wrap-around ends, no vehicle-specific hardware to work around. For a pair, the Schroth Caterham II at 578 pounds is designed for exactly this type of open-cockpit seven-style car and comes as two belts ready to go. If you need guidance on where to mount the shoulder straps on your specific build, give us a call. Getting the geometry right on the first fit is worth the conversation.
What fits
All seats below are base mount only. The bracket is custom-fabricated to the Cobra 291mm pattern for the Roadster 7 range.
| Seat | Mounting | Approval | Width | Weight | Harness slots |
|---|---|---|---|---|---|
| Bucket seats | |||||
| Cobra Roadster 7 Narrow Fit | Base mount (custom bracket) | Road and track | 400mm | 8.8kg | No |
| Cobra Roadster 7 Signature | Base mount (custom bracket) | Road and track | 400mm | 8.8kg | No |
| Cobra Roadster 7 Sport Signature | Base mount (custom bracket) | Road and track | 400mm | 8.8kg | Yes |
| Cobra Roadster 7 Sport Turbo | Base mount (custom bracket) | Road and track | 400mm | 8.8kg | Yes |
| Cobra Roadster 7 Sport Turbo Signature | Base mount (custom bracket) | Road and track | 400mm | 8.8kg | Yes |
Common questions
Is there an off-the-shelf seat frame for a Dax Rush?
No. There are no manufacturer-specific seat sub-frames listed for the Dax Rush. The mounting bracket is custom-fabricated, either picking up the original floor points or going direct to the chassis rails. Any competent fabricator can build to the Cobra 291mm base mount pattern.
What is the bolt pattern for the Cobra Roadster 7?
The Cobra Roadster 7 uses a 291mm base mount pattern. That is the measurement to work to when fabricating the bracket. Sparco, OMP and Corbeau base mount seats use 345mm x 271mm if you are considering other brands.
Why is the Cobra Roadster 7 the recommended seat for a Dax Rush?
It was designed for seven-style vehicles where interior space is limited. At 400mm wide it has been fitted to enough real Rush builds by our customers to give us clear confidence in recommending it ahead of wider competition shells, which tend to catch the chassis tubes.
When should I sort the seat mounting during a build?
At the build stage, with the body off if possible. Full access to the floor and chassis rails makes fabricating the bracket far simpler. Fitting a seat after the GRP body is on is possible but the access is much more restricted.
Do the Cobra Roadster 7 Sport Turbo variants have harness slots?
Yes. The Sport Turbo Narrow Fit and Sport Turbo Signature both have harness slots cut into the seat back. The standard and Signature versions are solid-back. If a harness is going in, ordering the Sport Turbo version saves modifying the seat later.
What harness fits a Dax Rush?
Any FIA 4-point belt will work physically, but the mounting points need sorting first. The Rush factory chassis has no shoulder strap points behind the seat. A roll cage or harness bar provides the correct geometry at roughly shoulder height. For the belt itself, the Willans Silverstone at 235 pounds is the most flexible option on a custom build.
Where do the harness shoulder straps mount on a Dax Rush?
Behind the seat at approximately shoulder height. The factory chassis does not include suitable mounting points at that location. A dedicated harness bar or roll cage needs to be part of the build before ordering a harness.
What is the difference between the Willans and Schroth harnesses listed here?
The Willans Silverstone uses wrap-around end fittings and an aircraft buckle, which makes it flexible on a custom-built car where mounting points may not match a standard vehicle. The Schroth Caterham II comes as a pair and is designed for the same category of open-cockpit car. The Schroth Lotus II variants have Lotus-specific lap strap hardware, which was designed for the Elise floor geometry rather than a custom bracket.
Can I fit a wider competition seat to a Dax Rush?
Most standard competition shells are too wide to clear the Rush chassis tubes without modification. The 400mm width of the Cobra Roadster 7 is the key measurement. If you have a specific seat in mind, give us the shell width and we can advise whether it is likely to clear.
Can I fit a passenger seat as well as a driver seat?
The Rush is a two-seat car, so yes, the passenger side needs sorting too. The same seat recommendation applies to both sides. If you are buying harnesses for both occupants, the pair products work out cheaper than individual belts.
More help
Similar open-cockpit kit car guides are available for the Caterham range, Westfield, and the Westfield MEV Rocket. If your build has specific requirements around cage integration, harness bar placement, or seat position relative to the roll hoop, give us the build details and we will work through what is needed before anything is ordered.
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