This is a genuine BMW dustcover plate, part number 33 12 1 214 073. The number stamped on the part is 33121214073; BMW's catalog files it under the short number 1214073. You will find it on our Suspension shelf, under Other Rear Axle parts.
It fits every E36 body style (318i, 318ti and 320i, 1992–1999), with the M40, M42, M43, M44, M50 or M52 engines — and the European-market versions.
BMW draws it on 3 diagrams, among them Drive Flange Suspension/Gasket Ring (33_0372) and Drive Flange Suspension/Gasket Ring (33_0461). It weighs about 25 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.