The most reasonably priced component used on the Cx500 1978 Usa Starter Motor is the Nut,thin 6mm.
This schematic depicts all components used in the Cx500 1978 Usa Starter Motor partslist.
Parts such as the Starter Motor: Nut,thin 6mm, O-ring,60x1.4, Washer,spring,6mm, Stay,starter are included in the Cx500 1978 Usa Starter Motor parts fiche.