This is a genuine BMW coding lable, part number 01 39 9 784 769. The number stamped on the part is 01399784769; BMW's catalog files it under the short number 9784769. You will find it on our Supplies & Hardware shelf, under Other Technical Literature parts. It supersedes the older number 9784735, so a part carrying that number is the same part.
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 the Sealing cap/plug (51_9855) diagram. It weighs about 10 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.