I suppose there is a small chance there is someone on here who has the 4 & 5 MP5 irons you are after, but as you are in the US it would cost quite a bit to post them across the pond - Surely a better bet would be someone like ironfinder.com who are based in the US? - You'd probably have to buy whatever irons you can find & get the shafts changed to match your set, but you could always swap the shafts over from your JPX900 Tours & then sell them on to offset the cost (?)
Another option, again if you found the clubs outside the US, would be to get the shafts removed & get the heads only posted to you (?)
Good luck ... Paul