You might try Yesterdays tractor or any of the old IH tractor sites. You might find that there are reproductions at this time that are not as much as you might think! Call a local dealer and see what he may be able to find. The right parts man maybe a buff and be able to help with your quest. It's been a while since these tractors have been in constant use so any used radiator might be well used.
tThanks for all your input ,I have talked to the guys at the radiator shop and they told me that they might be able to make it hold water. I have found a new one on the net for around 440.00$ just trying to get this tractor through winter feeding.