On this parts fiche the Bolt,hex 6x32 is the most specified component.
The component with the lowest price in the OIL PUMP - FILTER schematic is the Ball,steel.,10.
Parts such as the Oil Pump - Filter: Washer,filterlock, Bolt,hex 6x32, Bolt, Suction Valve, Washer,pump Lock are included in the Cb350k0 Super Sport Sweden Oil Pump - Filter parts fiche.