Drive unit lordosis pad — a genuine BMW part, number 52 10 8 151 911. The number stamped on the part is 52108151911; BMW's catalog files it under the short number 8151911. You will find it on our Interior Body shelf, under Tail trim.
It fits the E36 sedan, coupe and convertible (318i, 320i and 325i, 1992–1999), with the M40, M42, M43, M44 or M50 engines — and the European-market versions.
BMW draws it on 2 diagrams, among them Single Parts of Front Seat Controls (52_0497) and Front Seat Unlocking (52_0561). It weighs about 454 g (1.0 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.