The fourteen Gs450tx 1982 (z) Usa (e03) Chain Case - Shock Absorber component parts are all listed in this schematic.
The lowest price component in this Chain Case - Shock Absorber parts-list fiche is the Lock Washer.
Parts such as the Chain Case - Shock Absorber: Washer, Case,chain, Lock Washer, Washer(10.5x24x3.2) are included in the Gs450tx 1982 (z) Usa (e03) Chain Case - Shock Absorber parts fiche.