FTP Introduces our all new Designed and assembled in House 3 Piece M113K  Performance idler Pulley Set! Our 3 Piece Idler Pulley set is constructed from T6 6161 Billet Aerospace aluminum, on a 5 axis CNC. We then ensure the highest quality by removing tool marks and Hard Coat CLEAR anodize the entire pulley. We finish the pulleys with Genuine NACHI ZZ Rated Bearings. This Kit Includes all pulleys needed to replace the factory plastic idlers/tensioners on your 2003-07 55K AMG. These Pulleys are made to outlast your AMG.