Some items from this specific schematic: Pump Assembly,oil, Screw, Shim, O Ring(d:1.9,id:13).
This Oil Pump diagram displays the required parts for the Gs750b 1978 (c) Usa (e03) Oil Pump.
The most reasonably priced component used on the Gs750b 1978 (c) Usa (e03) Oil Pump is the Screw.