FTP Introduces our all new Designed and assembled in House 5 Piece M113K COMPLETE Performance idler Pulley Set! Our 5 Piece Idler Pulley set is costructed 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 anodise the entire pulley. We finish the pulleys with Genuine NACHI ZZ Rated Bearings. This Kit Includes all puleys needed to replace the factory plastic idlers/tensionsers on your 2003-07 55K AMG. These Pulleys are made to out last your AMG.