A sample from the products for the Taillight include: Nut,flange,6mm, Packing,seal, Light.licence, Cord.license..
The most reasonably priced component used on the Cx650c Custom 1983 (d) Usa Taillight is the Nut,hex.,cap,4mm.
This TAILLIGHT assembly utilises four Nut,flange,6mm(s) - the highest specified component.