Parts such as the Lower Crankcase: Bolt,flange,6x50, Crankcase,lower, Bolt,flg,8x135, Pkg,oil Case are included in the Cb450sc Nighthawk 1985 (f) Usa California Lower Crankcase parts fiche.
The component with the lowest price in the LOWER CRANKCASE schematic is the Washer,plug Drain 14.
With four applications this Bolt,flange, 6x32 is the most specified part.