Horton DM Advantage on/off clutch pack assembly - 7.15 clutch pack mounting bolt diameter, 5.39 clutch pack pilot diameter, 4-M8x1.25 clutch pack mounting studs - 2 at 77.5 & 2 at 102.5, 3.5 fan bolt circle, 2.56 dia fan pilot, 0.83 long 3/8-24 fa