The Nut, Crown (4k6) is the lowest priced item on this Fuel Tank schematic.
Some items from this specific schematic: Nut, Flange(38w), Fuel Tank Comp., Fuel Meter Assy, Packing,cap.
The Bolt, With Washer is the most widely applied product in the MA50M 1992 2FV ENGLAND 262FV-310E1 FUEL TANK ( four times ).