This is a genuine BMW gasket, part number 24 10 1 423 380. The number stamped on the part is 24101423380; BMW's catalog files it under the short number 1423380. You will find it on our Transmission shelf, under Mounting / suspension.
It fits every E46 body style (320i, 323i, 325i, 328i and 330i, 1999–2006), with the M52, M54 or M56 engines — and the European-market versions.
BMW draws it on the A5S325Z oil pan (24_0888) diagram. It weighs about 10 g (under 0.1 lb). It also comes in BMW kit Fluid filter kit, autom. transmission (2333915).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.