The most reasonably priced component used on the Rm85 2010 (l0) Usa (e03) Fuel Tank (model K8) is the Screw.
This schematic depicts all components used in the Rm85 2010 (l0) Usa (e03) Fuel Tank (model K8) partslist.
Of all the components used in this assembly the Tank,fuel(yellow) is the most expensive.