In this schematic the "Bolt,flange,sh,6x25" is used most often.
The Nut,hex.,cap 6mm is the cheapest item from this partsfiche.
Parts such as the Cylinder Head Cover: Bolt,flange,sh,6x25, Nut,hex.,6mm, Gskt,head,cover (nas), Insulator,carbure are included in the Z50j2 Monkey 1989 (k) Finland Rot Cylinder Head Cover parts fiche.