This schematic depicts all components used in the Gs650gt 1982 (z) (e01 E02 E04 E15 E16 E17 E18 E21 22 24 25 26 34 Left Handle Switch (model Z) partslist.
The component with the lowest price in the LEFT HANDLE SWITCH (MODEL Z) schematic is the Nut 6mm.
With two applications this Screw is the most specified part.