Of all the components used in this assembly the Seat.comp*type-2* is the most expensive.
A sample from the products for the F-20 Seat include: Seat.comp*type-2*, Nut,flange,6mm, Seat.comp.*type-1, Stay,seat Up.
The lowest price component in this F-20 Seat parts-list fiche is the Washer,plain, 6mm.