The Yamaha SEAT & CARRIER has twenty-three products enlisted in the schematic.
The Nut, Spring is the cheapest item from this partsfiche.
Parts such as the Seat & Carrier: Wire, Seat Hook, Label, Caution, Single Seat Assy, Spring, Compression are included in the Yq50 Aerox 2003 5wj1 Germany 1b5wj-300sb Seat & Carrier parts fiche.
