Contr.panel switch unit light/fog light — a genuine BMW part, number 61 31 6 911 645. The number stamped on the part is 61316911645; BMW's catalog files it under the short number 6911645. You will find it on our Electrical shelf, under Switch.
It fits every E46 body style (320i, 323i, 325i and 328i, 1999–2006), with the M52 or M54 engines — and the European-market versions.
BMW draws it on 3 diagrams, among them Installing Set Fog Lamps (03_2223) and Installing Set Fog Lamps (03_2224). It weighs about 75 g (0.2 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.