Parts such as the Radiator - Cooling Fan: Pl,rad R Side, Bolt,cap, 6x32, Cock,drain, Collar,rad Mount are included in the Cx500 1981 (b) Australia Radiator - Cooling Fan parts fiche.
The most reasonably priced component used on the Cx500 1981 (b) Australia Radiator - Cooling Fan is the Screw,flat,6x12.
With six applications this Screw Cross 6x12 is the most specified part.