The lowest price component in this Left Crankcase Cover - Rear Cover parts-list fiche is the Ball,steel.,10.
In this schematic the "Screw,cross 6x32" is used most often.
Parts such as the Left Crankcase Cover - Rear Cover: Screw,adjusting, Bolt,hex 6x25, Nipple,grease4.5, Gasket,cover (mca) are included in the Cb250k3 General Export Left Crankcase Cover - Rear Cover parts fiche.