Screw with lug — a genuine BMW part, number 52 10 1 960 639. The number stamped on the part is 52101960639; BMW's catalog files it under the short number 1960639. You will find it on our Interior Body shelf, under Tail trim.
It fits the E36 touring and compact (318ti, 1995–1999), with the M42 or M44 engines — and the European-market versions.
BMW draws it on 3 diagrams, among them Seat, rear, cushion, & cover, basic seat (52_0752) and Seat, rear, cushion, & cover, basic seat (52_0755). BMW's catalog calls for four of these at each place it is fitted. It weighs about 10 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.