The UPD M157 performance 5 Piece Idler Kit , includes all pulleys needed to replace the factory plastic idlers on your performance AMG with a high quality CNC billet aluminum machined performance pulley set. All five idlers fit E63 and CLS63. If you have a S63 , G63 or SL63 only the 4 small idlers are used and not the large idler shown in the kit. 

High quality Nachi bearings are used and only double metal bearings seals are used to protect bearings from heat and dirt.

All our billet performance idlers have a ultra hard anodized coating.

• CNC Billet hard anodized coated
• ZZ rated high speed Nachi bearings
• Smooth quiet running
• Easy install
• Made in USA and highest quality available

Replace your idlers with UPD`s performance idler set today, as the stock AMG plastic idler's, with rubber bearing seals are known to fail from the high heat and dirty conditions under the hood.