Some items from this specific schematic: Gasket(6.4x11.5x0.8) (nas), Hose(7x10.2x600), O Ring,fuel Tank Joint, Bolt(6x20).
The component with the lowest price in the FUEL COCK (MODEL R/S) schematic is the Bolt(6x20).
Of all the components used in this assembly the Cock Assembly,fuel is the most expensive.