This is a genuine BMW battery wiring cap, part number 51 47 8 206 645. The number stamped on the part is 51478206645; BMW's catalog files it under the short number 8206645. You will find it on our Interior Body shelf, under Other Body equipment parts.
It fits the E46 sedan (320i, 323i, 325i, 328i and 330i, 1999–2005), with the M52, M54 or M56 engines — and the European-market versions.
BMW draws it on 4 diagrams, among them Trunk trim panel (51_2186) and Trunk trim panel (51_2285). It weighs about 9 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.
