Parts such as the Front Master Cylinder: Washer, Cylinder Assembly,master, Bolt, Piston & Cup Set are included in the Gs750l 1981 (x) Usa (e03) Front Master Cylinder parts fiche.
The twelve Gs750l 1981 (x) Usa (e03) Front Master Cylinder component parts are all listed in this schematic.
On this parts fiche the Bolt is the most specified component.