The most expensive part in this assembly is the Advancer,spark.
Parts such as the Points / Spark Advancer: Plate,contact Brk, Bolt,flange,6x55, Cyln,contact, Cover,point are included in the Cb500k0 Four 1971 Usa Points / Spark Advancer parts fiche.
In this schematic the "Screw,cross,5x12" is used most often.