This is a genuine BMW connector cover, part number 61 13 1 393 791. The number stamped on the part is 61131393791; BMW's catalog files it under the short number 1393791. You will find it on our Electrical shelf, under Plug connection, terminal.
It fits every E36 body style (318i, 318ti, 320i, 323i and 325i, 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 Cable Covering/Control Unit Support (61_0076) and Cable Covering/Control Unit Support (61_4878). BMW lists the quantity used as “as required”. It weighs about 17 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.