Need Piston for 1973 Johnson or Evinrude 9.5 Hp outboard motor

[RayH66]

I am looking for a .030 oversized Piston for a 1973 Johnson (model 9R73B or 9RL73B) or Evinrude (model 9322B or 9323B) outboard motor. The part# is 385867. Any Piston in useable condition will do. The Piston Diameter for oversized is 2.305 inch. I found one Piston in the internet, buy need two to repair my motor. Does anyone know where I can get one?