Check out any of the fifteen Chain Case - Rear Shock Absorber (model Z) components enlisted.
Parts such as the Chain Case - Rear Shock Absorber (model Z): Shock Absorber, Washer, Washer, Washer are included in the Gsx1100x 1983 (d) Chain Case - Rear Shock Absorber (model Z) parts fiche.
On this parts fiche the Washer is the most specified component.