The component with the lowest price in the SEAT schematic is the Nut,flange,6mm.
The eleven Nu50 Urban Express 1983 (d) Usa Seat component parts are all listed in this schematic.
Parts such as the Seat: Grommet,ac Wire, Seat, Lid, Seat (lower), Rub,seat Stopper are included in the Nu50 Urban Express 1983 (d) Usa Seat parts fiche.