This kit is for ALL m157/M278 cars that have the upper center ABC pump on them and only includes 4 idlers for the SL63, CL63, S63 and SL550, CL550, S550 models. Made form 2012-2019 with M157/M278 engines. 

The M157/ M278 performance 4 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. 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 our performance idler set today, as the stock AMG plastic idlers, with rubber bearing seals, are known to fail from the high heat and dirty conditions under the hood.

Fits the below models and years in the M157/M278 engine only.   Pic three of the engine M157/M278 engine shows the large center pulley /ABC pump circled in red. This kit does not include this pump and non ABC cars will use our 5pc kit . Only the four idlers below on the engine pic are replaced.