This is a genuine BMW compression spring, part number 86 19 9 416 624. The number stamped on the part is 86199416624; BMW's catalog files it under the short number 9416624. You will find it on our Instruments & Electronics shelf, under Group 19.
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, indiv. parts, deflector housing (03_3770) and Trailer, indiv. parts, deflector housing (03_3771). It weighs about 418 g (0.9 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.