This is a genuine BMW circlip, part number 12 52 1 740 558. The number stamped on the part is 12521740558; BMW's catalog files it under the short number 1740558. You will find it on our Electrical shelf, under Other Engine Electrical System parts.
It fits every E46 body style (320i, 323i, 325i, 328i and 330i, 1999–2006), with the M52 or M54 engines — and the European-market versions.
BMW draws it on 2 diagrams, among them parts, periphery module wiring harness (12_0891) and wiring harness, engine grbx. module (12_1095). It weighs about 21 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.
