BMW e53 e65 e66 Drive Belt Tensioner pulley idler OEM ac compressor roller Drive Belt Tensioner with Pulley for A/C Compressor Belt Brand NEW part with full 1 year warranty. BMW part# 11 28 7 549 589, 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.