With all the components that make up the XR250R 1981 (B) USA SEAT / TOOLS assembly. The Nut,flange,6mm is the most frequently specified with four applications.
The Seat / Tools assembly is constructed from several parts from which the Seat Assy. is the most expensive.
The most reasonably priced component used on the Xr250r 1981 (b) Usa Seat / Tools is the Nut,flange,6mm.