To add credibility to it, Ford actually had admitted culpability back then in only offering replacement pistons at .002" oversized.
Today you can order any size replacement pistons and matching rings for $500 and $125.
You need to take the engine to a Ford specialist and have the thing honed, not bored and let the shop spec the size of the piston and rings.
In theory, they can all be different sizes.
So I suppose this is going to eliminate Ebay as the parts source and you will actually need to talk to a real live person?