This is a genuine BMW adapter, part number 12 52 1 427 322. The number stamped on the part is 12521427322; BMW's catalog files it under the short number 1427322. You will find it on our Electrical shelf, under Other Engine Electrical System parts.
It fits every E46 body style (320i, 323i and 325i, 1999–2006), with the M52, M54 or M56 engines — and the European-market versions.
BMW draws it on 3 diagrams, among them Diagnosis plug (61_1461) and Bracket, radio plug connection (61_1541). It weighs about 6 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.
