Of all the components used in this assembly the Arm B,up Rocker is the most expensive.
Parts such as the Valve - Upper Rocker Arm: Valve,in., Shaft.up Rockearm, Seal,valve Stem, Sp,valve Outer are included in the Cx500 1981 (b) Italy Valve - Upper Rocker Arm parts fiche.
This schematic depicts all components used in the Cx500 1981 (b) Italy Valve - Upper Rocker Arm partslist.