On this parts fiche the Sp A, Rocker Arm is the most specified component.
Some items from this specific schematic: Shaft.lo Rockearm, Oil Seal,17x28x7, Roller,5x8.5, Arm Rocker Low A.
eighteen components are listed in the schematic for this Cx500c 1982 (c) Canada E-7 Camshaft - Lower Rocker Arm .