This is not a "NACHI REPLICA" bearing like other listings on EBay with the black or blue seals. This genuine red seal NACHI bearing is manufactured in Japan and is the same identical bearing factory installed by Mercedes in the original pulley assembly. This is the only approved bearing for these ultra high performance vehicles. .  There are lots of listings on Ebay for this item however Genuine NACHI P/N: 45BGO7S5AIG-2DL bearings are near  impossible to find . Check the listing  carefully if it doesn't have a red seal it's not a genuine OEM bearing and will most likely fail within a few thousand miles.

OEM for the following Mercedes models with Kompressors:

Mercedes CL-CLASS. 03-06. Type W215

Mercedes E-CLASS 03-06 Type W211

Mercedes S-CLASS 03 Type W230

Mercedes S-CLASS 03-06 Type W220

Mercedes G-CLASS 05-11 Type W463

Mercedes SL-CLASS 04-08 Type W230

Mercedes CLS-CLASS 06 Type W219