The component with the lowest price in the FRONT FORK schematic is the Nut,hex 8mm.
Parts such as the Front Fork: Washer,spl.,8mm, Sp B,fr Cusion, Fork Assy.,l.fr., Pipe,bottom are included in the Cx500c Custom 1980 (a) France Front Fork parts fiche.
The sub assemblies and components that make up this Front Fork include this Case,r.bottom, the most expensive part.