Parts such as the Cylinder/cylinder Head: Head Comp.,cylind, Bolt,oil Check, Packing, Drain, Spark Plug (ngk) are included in the Cr125r 1991 (m) European Direct Sales / Cmf Cylinder/cylinder Head parts fiche.
On this parts fiche the Nut, Flange, 8mm is the most specified component.
The Nut,flange,6mm is the cheapest item from this partsfiche.