This is a genuine BMW information plate, part number 17 11 1 439 721. The number stamped on the part is 17111439721; BMW's catalog files it under the short number 1439721. You will find it on our Cooling System shelf, under Radiator with mounting.
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 6 diagrams, among them Expansion tank, manual gearbox (17_0140) and Expansion tank, automatic gearbox (17_0141). It weighs about 14 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.
