The lowest price component in this Oil Pump parts-list fiche is the Screw Cross 5x22.
Parts such as the Oil Pump: Pump Assy.,oil, O Ring 17.0x2.5, Gear,oil Pump, Screw Wash 5x16 are included in the Xl350r 1985 (f) Usa Oil Pump parts fiche.
This schematic depicts all components used in the Xl350r 1985 (f) Usa Oil Pump partslist.