This is a genuine BMW set of fittings f headrest cover, part number 52 10 8 267 524. The number stamped on the part is 52108267524; BMW's catalog files it under the short number 8267524. 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 6 diagrams, among them Seat, front, head restraint, basic seat (52_2573) and Seat, front, head restraint, sports seat (52_2581). It weighs about 5 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.
