1-1/2"-wide open belt drive kit designed to work exclusively with 45" motors installed in Paughco's frame Front pulley is specially cut with the correct taper for the 45" engine shaft Rear clutch assembly is a Big Twin 4-speed style to work with the frame conversion kit Paughco Rigid Frames for 45's 702-501, 702-502, 702-503, 702-504, 702-505, 702-506, 702-507 or 702-508