Some items from this specific schematic: Oring,6.8x1.9, Bolt,flange,6x40, Gskt,r,c/case Cov (mca), Gasket,right Cran (nas).
The component with the lowest price in the RIGHT CRANKCASE COVER schematic is the Bolt,flange,6x40.
The twenty Cm250c Custom 1983 (d) Usa California Right Crankcase Cover component parts are all listed in this schematic.