The component with the lowest price in the 032 FUEL TANK [MOD:F848;XST:AUS,EUR,FRA,JAP] schematic is the Screw Tef M6x12.
A sample from the products for the 032 Fuel Tank [mod:f848;xst:aus,eur,fra,jap] include: Spacer 8.2x12x24, Screw Tceif M5x14, Locks Kit, Tank Cap Complete.
In this schematic the "Screw Tef M6x12" is used most often.