This is an Original BMW Door Lock Knob.
The item is new, see photo.
Part numbers: 51211852140 ;
Fits:
3' E30 (12/1981 — 02/1994);
3' E36 (11/1989 — 05/1999);
5' E28 (09/1980 — 12/1987);
5' E34 (03/1987 — 06/1996);
7' E23 (10/1976 — 06/1986);
7' E32 (10/1985 — 04/1994);
8' E31 (07/1989 — 05/1999);
Z3 E36 (05/1997 — 06/2002);
Please ensure that it is a part for your model before buying.
