This is a genuine BMW painted jack fixture flap, part number 51 71 9 066 215. The number stamped on the part is 51719066215; BMW's catalog files it under the short number 9066215. You will find it on our Interior Body shelf, under Other Body equipment parts.
It fits every E36 body style (318i, 318ti, 320i, 323i, 325i, 328i and M3, 1992–1999), with the M40, M42, M43, M44, M50 or M52 and other engines — and the European-market versions.
BMW draws it on 2 diagrams, among them Cover door sill / wheel arch (51_2196) and M trim, sill / wheel arch (51_2761). It weighs about 7 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.
