BMW e53 e60 .. alternator belt Deflection Pulley Roller e63 e64 e65 e66 Deflection Pulley for Water Pump/Alternator Belt (Center Mounting) BMW part# 11 28 7 549 557, check fit below. Recently made by INA (OEM), not been lying around. Please NOTE the mid-year split on PRODUCTION date. Not sure about your car? email us your VIN to confirm. NOTE: x5 fits 4.4i and 4.8is only.