A sample from the products for the Valve - Upper Rocker Arm include: Washer,wave 1.5mm, Shaft,rocker Arm, Rod Comp.,push, Retainer, Vlv Spr.
On this parts fiche the Cotter, Valve is the most specified component.
The fifteen Cx500t Turbo 1982 (c) European Direct Sales Valve - Upper Rocker Arm component parts are all listed in this schematic.