This is a genuine BMW window guide rail left, part number 51 32 1 977 585. The number stamped on the part is 51321977585; BMW's catalog files it under the short number 1977585. You will find it on our Interior Body shelf, under Other Body equipment parts.
It fits the E36 coupe and convertible (318i, 323i, 325i, 328i and M3, 1992–1999), with the M42, M43, M44, M50, M52 or S50 and other engines — and the European-market versions.
BMW draws it on 2 diagrams, among them Door Window Lifting Mechanism Front (51_2055) and Door Window Lifting Mechanism Front (51_2121). It weighs about 524 g (1.2 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.
