A Planted Technology seat bracket for the BMW 3 Series saloon on the E46 chassis, 1999 to 2005. Part number SB121.
Saloon is the qualifier. The E36 coupe takes SB006 and the E36 saloon takes SB108, so both the chassis code and the body style decide the part.
Why the E46 is the car it is
It is one of the most used cars in club motorsport in this country. Cheap to buy, good enough to be worth building, and supported by an aftermarket that will sell you anything. The M3 in particular is quick enough that the standard seat is the first thing to become a limitation, even the sports seat.
Check the floor before you spend
This matters more on an E46 than on most cars, because the rear subframe mounting problem these are known for means a great many have had structural work. If the car has been repaired, look at what was done around the seat area with the carpet up. A bracket can only feed seat load into sound structure.
Also worth knowing
We stock an OMP subframe for the same car, so if you want a matched OMP seat and mount package, ask us.
Handed, and the factory seats carry side airbags.
Have you written anything about this exact product?
Yes, we have covered this exact product: Top 5 reclining seat choices for your BMW 3 Series Sedan [E36], including our fitting guide, and Top 5 reclining seat choices for your BMW 3 Series Coupe [E46], including our fitting guide. 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 3 Series Sedan [E46 Chassis] (1999-2005). 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.