Parts such as the Oil Pump: Pump Assembly,oil, Pin(4x15.8), Screw 6x12, O Ring(d:1.9,id:13) are included in the Gs750c 1978 (c) Usa (e03) Oil Pump parts fiche.
With three applications this Screw is the most specified part.
The Suzuki OIL PUMP has ten products enlisted in the schematic.