Planted Seat Bracket - BMW 3 & 4 SERIES / M3 & M4 [F30 / F31 / F32 / F33 / F34 / F36 / F80 / F82 / F83 CHASSIS] (2011+)7 10 day build time Planted Seat Bracket BMW 3 & 4 Series M3 & M4 [F30 F31 F32 F33 F34 F36 F80 F82 F83 Chassis] (2011+) The Planted Seat Bracket is a vehicle specific bracket used as an adapter between the floor of the vehicle and an aftermarket seat and it's accessories. Because the floor of each vehicle varies and typically is not flat, a vehicle specific Seat Bracket is required for installing an aftermarket seat. We create each seat bracket using