On this parts fiche the Clip B,fuel Hose is the most specified component.
Parts such as the Air Suction Valve: Nut,hex.,5mm, Tube B,air Pipe, Screw-washer,5x18, Pipe Comp,l Air are included in the Cb600f Hornet 1998 (w) England Mkh Air Suction Valve parts fiche.
The component with the lowest price in the AIR SUCTION VALVE schematic is the Screw-washer,5x18.