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I have under drives for my 91, just bought new belts the 4 rib is K040510 and the 6 is K060455
I had the sho source crank pulley one and I think it uses a different size belt than the sho shop one.

Anyone running both the SHO Shop set and the SHO Source UDP?![]()

Anyone running both the SHO Shop set and the SHO Source UDP?![]()