Dale
I'd consult with a good tire shop, and see if there is a replacement that is a metric version of basically the same size, and how much difference in size might be acceptable. Really though, if 2 tires are bad, and it has been sitting so long, how are the other two? It really might be good insurance to replace all 4. Been down that road before, and it can get expensive fast when you have a flat in the middle of nowhere, and are at the mercy of a local tow outfit. Should also mention make sure you buy trailer tires, and not car tires, as the weight rating and sidewall construction is often different. Good luck on your move.
Larry