This is a genuine BMW screw pipe, part number 21 52 1 162 149. The number stamped on the part is 21521162149; BMW's catalog files it under the short number 1162149. You will find it on our Clutch & Flywheel shelf, under Clutch control (hydraulics).
It fits every E36 body style (318i, 318ti, 320i, 323i, 325i and M3, 1992–1999), with the M40, M42, M43, M50, M52 or S50 engines — and the European-market versions.
BMW draws it on 2 diagrams, among them Clutch control (21_0063) and Clutch control (21_0289). It weighs about 54 g (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.