Xtreme Outdoor Power Equipment Replaces MTD Cub Cadet Troy Bilt ZT RZT 42 50 Mustang XP PTO Clutch 917-04622 717-04622 917-04183 717-04183 5219-99 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: 050520, 717-04183, 717-04622, 917-04183, 917-04622, GT1A-MT09 Replaces Warner: 5219-99 Specs: 1.000" Crankshaft, 5.6" Pulley, Counter Clockwise, 1/2" or 5/8" Belt, 125 ft. lbs. torque Free Upgraded - High Temperature Bearings. TOUGH Machined Billet Pulley with Replaceable Bearing - OEM Upgrade