This is a genuine BMW bulb Polar, part number 07 50 0 030 663. The number stamped on the part is 07500030663; BMW's catalog files it under the short number 0030663. You will find it on our Supplies & Hardware shelf, under Group 50.
It fits the E46 sedan, coupe, convertible and touring (320i, 323i and 325i, 1999–2006), with the M52, M54 or M56 engines — and the European-market versions.
BMW draws it on 2 diagrams, among them Front/Front Lateral Turn Indicator (63_0455) and Front/Front Lateral Turn Indicator (63_0557). BMW's catalog calls for two of these at each place it is fitted. It weighs about 20 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.