The most expensive part in this assembly is the Shock Absorber, Rear.
Parts such as the Chain Case - Shock Absorber: Washer (12.5x24x3.2), Washer,lock, Washer, Nut, Lower Lh are included in the Gs450e 1983 (d2) General Export (e01) Chain Case - Shock Absorber parts fiche.
Of all the components that make up this Chain Case - Shock Absorber the Lock Washer has the lowest price.