Parts such as the Exhaust Muffler: Collar,ex.pipe, Nut,flange,6mm, Muffler Comp,l,ex, Rubber A,stand are included in the Cb250rs 1980 (a) South Africa Exhaust Muffler parts fiche.
The most reasonably priced component used on the Cb250rs 1980 (a) South Africa Exhaust Muffler is the Nut,flange,6mm.
In this schematic the "Collar,ex.pipe" is used most often.