Parts such as the Cylinder: Dowel,pin,10x16, Cylinder Comp, Cylinder Comp, Gasket,cylinder (nas) are included in the Cb250 1994 (r) Spain / Spo Cylinder parts fiche.
The Nut,hex 6mm is the lowest priced item on this Cylinder schematic.
With two applications this Dowel,pin,10x16 is the most specified part.