Xtreme Outdoor Power Equipment Replaces Grasshopper Models: 321D 322D 388740 PTO Clutch - New Heavy Duty Fatboy Xtremely cool coil design runs over 20% cooler for a longer service life  plus every clutch is backed by a buyer-protection 1-year warranty Replaces OEM: 388740 Replaces Warner: 5218-65E, 5218-65, 5218-303, 5218-225 Specs: 1.125 Crankshaft, 6.31" Pulley, Clockwise, 1/2" or 5/8" Belt, 205 ft. lbs torque Free Upgraded - High Temperature Bearings. TOUGH Machined Billet Pulley with Replaceable Bearing - OEM Upgrade