The lowest price component in this Cylinder/pistons parts-list fiche is the Pin,dowel,10x8.2x14.
Some items from this specific schematic: Ring-set-piston Ll,o/, Ring-set-piston,std, Piston-engine,std, Pin,11x14x12.3.
This CYLINDER/PISTONS assembly utilises eight Circlip,piston Pin(s) - the highest specified component.