Craftsman 137553 Lawn Tractor Mandrel Shaft Genuine Original Equipment Manufacturer (OEM) part for Craftsman, Poulan, Western Auto, Frigidaire, Sears, Weed Eater, & Tower Height:4 7/8" Overall, has 5 point star. Double hex external spline for pulley. Shaft used in 143651 spindle assembly. Replaces Shaft 137553, This item includes both upper and lower bearing,Also includes top pulley nut and bottom blade screw.