Genuine BMW part 51 49 8 208 924: Bump stop. The number stamped on the part is 51498208924; BMW's catalog files it under the short number 8208924. You will find it on our Interior Body shelf, under Other Body equipment parts.
It fits the E36 compact (318ti, 1995–1999), with the M44 engine — and the European-market versions. It also fits the E46 compact (316ti, 318td, 318ti, 320td and 325ti, 2001–2004), with the M47N, M54, N40, N42, N45 or N46 engines.
BMW draws it on 3 diagrams, among them Trim panel, trunk lid (51_2181) and Trim panel, trunk lid (51_4498). BMW's catalog calls for two of these at each place it is fitted. It weighs about 10 g (under 0.1 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.