This starter relay is compatible with the following models: 400, 450, 500 X5U5, 500S, 520 X5HO, 550, 600 X6, U6, Z6, 625 Touring, 800XC, 850, and 1000.It corresponds to part numbers 9CR6-150310 and 9010-150310-100.Designed as a direct replacement for the starter relay, it supports of the starting system and features standard fitment for easy installation.