A Planted Technology seat bracket for the BMW Z4 and M Coupe and Roadster, 2002 to 2008. Part number SB126.
The E85 roadster and E86 coupe. The M versions of both are the ones people build.
The M Coupe is the interesting one
BMW put the S54 straight six from the E46 M3 into a short, stiff shooting brake body. It is one of the more focused things they have built and it is appreciating sharply because so few were made.
If yours is an M Coupe, keep everything original that you can. The bracket picks up the factory mounting points so nothing is cut, and the seats come out whole.
Space in the coupe versus the roadster
Genuinely different. The coupe has a fixed roof and a hard headroom limit; the roadster does not but has the hood mechanism behind you. Both are tight round the shoulders. Tell us which body you have and your height, because the right shell differs between them.
Side airbags are fitted. Handed, so order twice for a pair.
Have you written anything about this exact product?
Yes, we have covered this exact product: Lexus Planted Technology Frames Updated For 2026, and Customer Car: Subaru Impreza With Corbeau RRS Seats and Planted Technology Brackets. That is first-hand coverage from our own builds and showroom, not brochure copy.
Will this fit my car?
This frame is made for the BMW Z4 Roadster. Chassis code and years matter more than the badge, as floor pans change between generations, so if your car sits near a changeover year, send us the registration and we will confirm before you order.
Which seats does it take?
Check the bolt pattern in the specification against your seat. The Compatible seats tab above lists what bolts straight on. If your seat is not listed, tell us what you run and we will confirm the fit.
Do I keep fore-and-aft adjustment?
Only with a sliding runner between the frame and the seat, which is a separate part on Planted frames. If more than one person drives the car, budget for the runner. Our guide to sliding runners explains the options and widths.
Is this for the driver or passenger side?
Both sides are available on this listing, pick driver or passenger side at the point of order (sides listed are for right-hand-drive cars). Left-hand-drive car? Ask us, as the sides swap over and availability varies by model.