The most reasonably priced component used on the Cx500 1980 (a) South Africa Clutch is the Nut,cap,20mm.
Some items from this specific schematic: Disk,clutch Fri (mca), Plate B,clutch, Plate,clutch Lif, Center ., Clutch.
With five applications this Disk,clutch Fri (mca) is the most specified part.