This is a genuine BMW frame right, part number 52 10 8 259 664. The number stamped on the part is 52108259664; BMW's catalog files it under the short number 8259664. You will find it on our Interior Body shelf, under Tail trim.
It fits the E46 convertible (323i, 325i, 330i and M3, 2000–2006), with the M52, M54 or S54 engines — and the European-market versions.
BMW draws it on 2 diagrams, among them Front Seat Backrest Unlocking (52_2579) and Seat, front, backrest frame (52_3117). 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.
