Genuine BMW part 52 10 9 401 975: Retrofit kit, lumbar support, left. The number stamped on the part is 52109401975; BMW's catalog files it under the short number 9401975. You will find it on our Interior Body shelf, under Tail trim.
It fits the E36 sedan, coupe and convertible (318i, 320i, 325i and M3, 1992–1999), with the M40, M42, M43, M50 or S50 engines — and the European-market versions.
BMW draws it on the Supplementary Set Support Lordosis (03_2676) diagram. It weighs about 797 g (1.8 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.
