B4900a Rebuild Kit
Coleman, Sanborn Pumps & Parts

Price: $379.88
Found under the following brands:
Chicago Pneumatic, US General, Belaire, Kobalt, NAPA, IMC-ATLAS COPCO
Kit includes: Gasket Kit, Ring Set (LP and HP) and Rod Insert Bearings.
Does not include the Valve Plate Assembly or the Air Filter.