The most reasonably priced component used on the Ar50c8 1990 Europe Uk Nl Gr Sa Crankshaft/piston is the Woodruff Key-pry Pini.
The Crankshaft/piston assembly is constructed from several parts from which the Crankshaft-comp is the most expensive.
This schematic depicts all components used in the Ar50c8 1990 Europe Uk Nl Gr Sa Crankshaft/piston partslist.