This is a genuine BMW drilling template left, part number 51 71 2 250 003. The number stamped on the part is 51712250003; BMW's catalog files it under the short number 2250003. 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 and 328i, 1992–1999), with the M40, M42, M43, M44, M50 or M52 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 334 g (0.7 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.