The 93 and below crank has 4 ribs for the power steering pulley. The 94+ TT cranks have only 3 ribs as they use an NA power steering pump since switching to electronic HICAS. I am using an earlier style TT motor/crank with the newer NA Power steering pump that came off my old 94 TT. I am using a 3 rib belt that connects them, and there is just an extra un-used rib on the crank. I could switch over the pump pulley as well to then use a 4-rib belt, but I didn't think it was necessary.