Description Wheel bearing kit, services one wheel. Disc Harrows: 520, 620, 720, 820. Plows: 43, 345 (with 1-3/4" O.D.) gauge wheel, 370 (reversible) gauge wheel. Chisel Plows: 129 (main wheels & crank type gauge wheel), 139. This item is a suitable alternative for the following: MF-WBK520