The most reasonably priced component used on the Gs650g 1982 (z) (e01 E02 E04 E06 E16 E18 E21 E22 E24 E39) Cylinder Head Cover (model X) is the Pin(6.2x8x11).
Some items from this specific schematic: Bolt,rear, Gear,tachometer Driven, Gasket (mca), Cap,cylinder Head Cover.
In this schematic the "Bolt" is used most often.