The lowest price component in this 22 Fuel Tank parts-list fiche is the Bolt, With Washer(3ns).
Some items from this specific schematic: Damper, Locating 1, Clip 1432435600, Hose (l30), Screw, Pan Head(3sx).
The 22 Fuel Tank is made up of components including this Fuel Tank Comp. which is the most expensive.