The component with the lowest price in the CRANKCASE COVER schematic is the Screw Pan Head.
Parts such as the Crankcase Cover: Screw Pan Head, Screw Pan Head, Pin, Dowel, Cover, Crankcase (r.h) are included in the Rx50 50special 1983 (d) Usa Crankcase Cover parts fiche.
In this schematic the "Screw Pan Head" is used most often.