Crossing my fingers on the 70 or 35 pistons working! If it seems like it can be swapped I will probably find a cheaper donor 70! If not, I will probably sell the boiler/firebox, and hold onto the cast iron engine base to make my own piston. Trust me when I say I am trying to put the right parts on this haha, but you gentlemen seem to enjoy bidding on ebay Jensens hahaha!