With two applications this Circlip (2f1) is the most specified part.
Some items from this specific schematic: Piston Ring Set (3rd O/s), Bearing, Cylindrical(56a), Piston Assy (1st O/s), Pin, Crank.
The lowest price component in this Crankshaft-piston parts-list fiche is the Circlip (2f1).