The most reasonably priced component used on the Sfx50mm 1999 (x) France Seat/luggage Box is the Bolt-washer,6x12.
The sixteen Sfx50mm 1999 (x) France Seat/luggage Box component parts are all listed in this schematic.
A sample from the products for the Seat/luggage Box include: Stay,rr Inner, Cushion,luggage B, Washer,plain,6mm, Tray Fuel Tank.