Parts such as the Headlamp (ds100n: Spring,headlamp Unit, Washer, Screw, Lock Washer are included in the Ds100 1981 (x) Usa (e03) Headlamp (ds100n parts fiche.
The most reasonably priced component used on the Ds100 1981 (x) Usa (e03) Headlamp (ds100n is the Screw.
The Headlamp (ds100n assembly is constructed from several parts from which the Lamp Assembly,head is the most expensive.