The twenty Gs750 1978 (c) Usa (e03) Chain Case - Shock Absorber component parts are all listed in this schematic.
Of all the components that make up this Chain Case - Shock Absorber the Washer(6.5x18x1) has the lowest price.
The Chain Case - Shock Absorber assembly is constructed from several parts from which the Absorber Assembly,rear Shock is the most expensive.