Of all the components used in this assembly the Crankcase,lower is the most expensive.
Parts such as the E-10 Crankcase: Bolt,stud,8x193, Bolt,stud,8x49, Orifice, Oil, Bolt,flg.,10x166 are included in the Xr500r 1982 (c) E-10 Crankcase parts fiche.
The Bolt,hex 6x12 is the lowest priced item on this E-10 Crankcase schematic.