Parts such as the Clutch Cover - Oil Pump: Gasket(6.2x11x1).2 (nas), Screw, Lock Washer, Bolt(6x10) are included in the Jr50 1978 (c) Usa (e03) Clutch Cover - Oil Pump parts fiche.
Of all the components used in this assembly the Crankcase Set is the most expensive.
Check out any of the nineteen Clutch Cover - Oil Pump components enlisted.