Sensor mat, co-driver's airbag — a genuine BMW part, number 65 77 6 921 952. The number stamped on the part is 65776921952; BMW's catalog files it under the short number 6921952. You will find it on our Instruments & Electronics shelf, under Other Audio, Navigation, Electronic Systems parts. It supersedes the older number 8099028, so a part carrying that number is the same part.
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 Electric parts, airbag (65_0488) and Electric parts, airbag (65_0663). It weighs about 30 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.