Parts such as the Tailllight: Cord Comp.,tail, Sub Cord Taillght, Taillight Assy., Screw,tap.,4x18 are included in the Cx500d Deluxe 1980 (a) Canada Tailllight parts fiche.
The Screw,cross,4x10 is the lowest priced item on this Tailllight schematic.
In this schematic the "Screw,tapping4x12" is used most often.