The heavy-duty clutch rebuild kit refreshes the heavy-duty slipper clutch with new steel disc, aluminum friction pads (3), spring, pin, 5x8 washer, 4 mm locking nut, and 5 mm locking nut. The aluminum friction pads offer greater heat resistance and can be used in place of the composite pads found in the standard-duty clutch. Fits 5351 pressure plate and hub.