Gasket set differential for 320i all years of manufacturing fits only for 5 speed sports gear box, you need 1 for 1 car and for 323i all years of manufacturing without cat fits only for 5 speed sports gear box, you need 1 for 1 car and for 323i up to 05/1983 without cat fits only for automatic gear box and 5 speed overdrive gear box, you need 1 for 1 car and for 323i up to 09/1984 without cat only for country version E, F, I, you need 1 for 1 car, only in conjuction with shaft seal outer

BMW Sedan 320i, 323i, M3 (E30)