1, OEM Upgraded Spec. 2, Heavy duty and extended service life. 3, A direct replacement and easy to mount. 5, Specs: 1.0″ Crankshaft only , 6.00″ Pulley, Counter Clockwise, 5/8 Belt, 125 ft. 1, High temperature bearings with high temperature grease can resist hot and vibration to offer a long service life. 2, Machined Billet Pulley for stronger, quieter, and smoother performance increasing belt life and maximizing blade speed. 3, Standard friction material represents the optimum in high torque performance and long life. 4, Stainless steel break rivets and anti backlash armature Consistent torque and engagement time in whole life. For ZOOM 1634 1840 2040 2150 2350 2450. For ZT 1634 1734 1840 2040 2250 2350 2450 2550 HVZ1840. Replaces OEM Part Numbers. Warner:5219-164, 5219-135, 5219-136, 5219-137, 5219-77, 5219-171, 5219-170, 5219-107, 5219-159, 5219-158, 5219-177, 5219-164. XTREME:X0127, X0127-K, X0337, X0337-K, X0338, X0338-K, X0502, X0339, X0339-K, X0545, X0377, X0377-K, X0557, X0718, X0585, X0331, X0722, X0726, X0732, X0736, X0741. 1 x PTO Clutch. 1 x Wiring Harness. 1 x Manual Book. (No service on Weekend and public holidays). After we have a fully communication. All return products should be in brand new state with all accessories included.