Parts such as the Cylinder/cylinder Head: Nut, Flange, 8mm, Joint,ex.pipe, Spark Plug (qn84), Seal,exhaust Pipe are included in the Cr125r 1990 (l) Canada / Cmf Cylinder/cylinder Head parts fiche.
In this schematic the "Nut, Flange, 8mm" is used most often.
The lowest price component in this Cylinder/cylinder Head parts-list fiche is the Nut,flange,6mm.