OE Number of Belt Tensioner: 12562347/12557838Fitment of Belt Tensioner Assembly: for Cadillac DeVille 4.6L V8 1994-2005 for Cadillac DTS 4.6L V8 2006-2011 for Cadillac Seville 4.6L V8 1993-2004 for Cadillac Eldorado 4.6L V8 1993-2002 for Buick Lucerne 4.6L V8 2006-2011 for Oldsmobile Aurora 4.0L V8 1995-2003 for Pontiac Bonneville 4.6L V8 2004-2005 Specification of Automatic Belt Tensioner Pulley Assembly: Type: Belt Tensioner Material: Metal Other Name: Tensioner Pulley, Drive Belt Tensioner Pulley, Belt Tensioner Include: 1 Pc x Belt Tensioner Assembly Feature of Belt Tensioner w/Pulley: Replace the old or broken belt tensioner to avoid noisy tensioner pulley and no longer withstand belt noise. Ensure that the drive belt always maintains the proper tension, supports the belt and guides it to run in a predetermined path, and reduces the vibration and noise generated by the belt during operation. Solid metal for wear resistance, not easy break or deform, ensure longer service life. This is a non-OEM product, accessory only!