A4028R Clutch Driver Fits John Deere Tractor Model A AO AROne New Aftermarket Replacement Clutch Drive Disc Fits John Deere Tractor Models A, AO, and AR This aftermarket replacement clutch drive disc (also referred to as a clutch driver) is Fits John Deere (Fits JD) Model A, AO, and AR two cylinder tractors. The disc is part of the belt pulley and transmission clutch assembly, transferring power from the crankshaft through the clutch system. Note serial number restrictions below verify your serial number