On this parts fiche the Washer(6.5x20x1.6) is the most specified component.
The Seat (model K7) assembly is constructed from several parts from which the Handle,pillion Rider is the most expensive.
A sample from the products for the Seat (model K7) include: Cushion, Cushion,ctr, Cushion,support(50x25x32), Hook,pillion Rider Handle.