This is a genuine BMW left stabilizer support, part number 41 11 8 151 121. The number stamped on the part is 41118151121; BMW's catalog files it under the short number 8151121. You will find it on our Exterior Body shelf, under Other Bodywork parts.
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 Front Body Parts (41_0043) and Front Body Parts (41_1622). It weighs about 350 g (0.8 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.