The Hull Fittings assembly is constructed from several parts from which the Damper,water Muffler, is the most expensive.
Some items from this specific schematic: Bolt-ws, Damper,fuel Tank, Damper,fuel Tank,lh, Bracket-seat,cnt,lh.
The lowest price component in this Hull Fittings parts-list fiche is the Washer-plain-small,6m.