The component with the lowest price in the STEP schematic is the Washer,plain, 6mm.
Parts such as the Step: Pin, Bar Joint, Bolt,flange,6x18, Arm Comp.,r.step, Rubber,pillion are included in the Cx500 1980 (a) European Direct Sales Step parts fiche.
The sub assemblies and components that make up this Step include this Step Assy.,r., the most expensive part.