Xtreme Outdoor Power Equipment Replaces John Deere PTO Blade Clutch L120 L130 GY20878 GY20108 GY20652 GY21340 - OEM Upgrade !!!! 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: GY20108, GY20652, GY20878, GY21340 Replaces Warner: 5219-20 5219-73 Specs: 1.000" Crankshaft, 6.310" 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