Parts such as the Oil Pump: Tube,4.5x9x545, Pump-assy-oil, Clamp, Tube,3x5.8x74 are included in the Ar50a1 1982 Usa Oil Pump parts fiche.
The Oil Pump is made up of components including this Pump-assy-oil which is the most expensive.
The Screw-pan-cros is the lowest priced item on this Oil Pump schematic.