Parts such as the Rear Master Cylinder: Diaphragm, Hose,reservoir Tank, Piston/cup Set, Bolt (8x30) are included in the Gs1000h 1980 (t) (e01 E02 E04 E17 E18 E21 E22 E24 E34) Rear Master Cylinder parts fiche.
In this schematic the "Nut" is used most often.
The nineteen Gs1000h 1980 (t) (e01 E02 E04 E17 E18 E21 E22 E24 E34) Rear Master Cylinder component parts are all listed in this schematic.
