The most reasonably priced component used on the Gs650g 1981 (x) Usa (e03) Front Calipers (model Z) is the Bolt(10x37).
Parts such as the Front Calipers (model Z): Piston Set, Shim,pad, Seal,piston, Boot are included in the Gs650g 1981 (x) Usa (e03) Front Calipers (model Z) parts fiche.
This FRONT CALIPERS (MODEL Z) assembly utilises four Pad,guide(s) - the highest specified component.