The Seat assembly is constructed from several parts from which the Seat Comp,double is the most expensive.
This part-list fiche shows all the components that make up the Cx500d Deluxe 1980 (a) Usa Seat .
The most reasonably priced component used on the Cx500d Deluxe 1980 (a) Usa Seat is the Nut,flange,6mm.