77mm clutched pulley
https://mbworld.org/forums/e55-amg-w...available.html
The Best of Mercedes & AMG
Mine does not even have the arp bolt and it has no issues and a few guys that I know had the pulley put on at the same place and no issues, one guy has over 60k miles on it.

E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
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