This is a genuine BMW spacer pin, part number 86 29 9 416 288. The number stamped on the part is 86299416288; BMW's catalog files it under the short number 9416288. You will find it on our Instruments & Electronics shelf, under Group 29.
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 5 diagrams, among them Trailer motorcycle module (03_3715) and Trailer motorcycle module (03_3716). It weighs about 692 g (1.5 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.