This part is listed by BMW as BMW part number 33521129263 (33-52-1-129-263) and is described as Genuine BMW Rear Shock Protection Tube (Shock Bellows) for BMW E30 318i, 318is, 325e, 325es, 325i, 325is, 325ix, M3 Coupe/Sedan (1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991), E30 318i, 325i Convertible (1987, 1988, 1989, 1990, 1991, 1992, 1993), E36 318ti (1994, 1995, 1996, 1997, 1998, 1999) and Z3 1.9, 2.3, 2.5, 2.8, 3.0 (1996, 1997, 1998, 1999, 2000, 2001, 2002).