Parts such as the Valve - Upper Rocker Arm: Nut, Tappet Adjg., Seal,valve Stem, Washer,wave 1.5mm, Rod Comp.,push are included in the Cx500 1978 Australia Valve - Upper Rocker Arm parts fiche.
The lowest price component in this Valve - Upper Rocker Arm parts-list fiche is the Nut, Tappet Adjg..
The most expensive part in this assembly is the Arm B,up Rocker.