The lowest price component in this Fuel Pump parts-list fiche is the Bolt,flanged,6x16.
four components are shown in this Kx450-fcf Kx450f 2012 Usa Fuel Pump exploded diagram.
A sample from the products for the Fuel Pump include: Pump-fuel, Tube-assy,fuel, Bolt,flanged,6x16, O Ring.