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 replaces part numbers 9CR6-150310 and 9010-150310-100.This direct replacement relay supports consistent starting system performance and is designed for straightforward installation.