A Planted Technology seat bracket for the Audi S4 on the C4 chassis, 1991 to 1994. Part number SB142.
The naming is genuinely confusing on this car
Audi renamed the range partway through the generation. The C4 S4 became the C4 S6 in 1994 with no significant change to the car, so a 1994 S4 and a 1995 S6 are close to the same thing. If yours is an S6 of that era, send us the registration and we will confirm this suits it.
Separately, the later B5 S4 is a completely different car on a different platform, and the two get confused constantly because both are called S4.
What the C4 S4 is
The 2.2 litre five cylinder turbo, the last of Audi’s five pot performance saloons before the V6 took over. That engine is the reason these have a following and the reason the good ones are appreciating.
Practical
Thirty years old. The bracket picks up the factory mounting points so nothing is cut, and original interiors are getting scarce. Get the carpet up before you spend.
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 Audi S4 C4. 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.