The Bolt-upset-ws,6x25 is the most widely applied product in the KLF220-A1 BAYOU220 1988 USA FUEL TANK ( three times ).
The component with the lowest price in the FUEL TANK schematic is the Bolt-upset-wsp.
A sample from the products for the Fuel Tank include: Tank-comp-fuel, Damper,25x31x50, Collar,6=16.1, Cap-assy-tank,fuel.