One new aftermarket replacement fits John Deere Water Pump (with 3/8″ pulley) that fits Tractor Models: A (S/N 700200>), AO (S/N 281400>), AR (S/N 281400>), 60, 620, and 630. Comes with gasket. All with bypass cooling system which requires a small port in the base of the pump (see pictures). PLEASE NOTE: If your tractor does NOT use a bypass cooling system, you can plug the bypass hole with part number F2282R – find this item in our store. ACTUAL PHOTOS. Replaces parts: AA6327R, AA6372R