Parts such as the Seat: Seal, Manual Owner's, Hinge, Seat, Bolt are included in the Cw50rs 2005 2b13 Spain 1d2b1-300g2 Seat parts fiche.
The Washer(6ta) is the cheapest item from this partsfiche.
Of all the components used in this assembly the Double Seat Assy is the most expensive.