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I'm currently putting a set of Billet idler pulleys on my 2013 C63. I'm trying to put the serpentine belt back on, but all the threads and belt diagrams I have found to reference do not show one with the extra pulley down at the bottom. Does anybody have a belt routing diagram that shows it with this extra pulley? I currently have it running like this, but I'm thinking maybe the belt should go up and over the idler pulley? Thanks for any help I don't know why my goggle search fu is so weak