Of all the components used in this assembly the Crankshaft Assy is the most expensive.
A sample from the products for the Crank - Piston include: Pin, Dowel B (6h3), Clip, Piston Pin, O-ring (688), Washer, Plate(663).
The most reasonably priced component used on the 70 Etln 1984 Crank - Piston is the Washer, Plain (646).