Of all the components used in this assembly the Crank Assy is the most expensive.
A sample from the products for the Crank-piston include: Piston Ring Set (1st O/s), Key, Wood Ruff (324), Oil Seal (878)., Piston (std) 4th O/s.
The most reasonably priced component used on the Ex440c 1979 Crank-piston is the Clip 6041163400.