The most reasonably priced component used on the Dt100 1981 (b) Usa Rear Arm-suspension is the Bolt, Hexagon (509).
The sub assemblies and components that make up this Rear Arm-suspension include this Rear Cushion Assy, the most expensive part.
This part-list fiche shows all the components that make up the Dt100 1981 (b) Usa Rear Arm-suspension .