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Viton would work.
Try the following, compatibility chart. That is one I just found but have seen alot better ones.
Good Luck
http://www.manuf-rubber.com/pdf/Material-Guide.pdf
Might be cheaper to take it out and have a radiator shop dunk it and fix what is wrong. That is alot cheaper than just buying a new one. If it is too bad, at least you tried!
Best wishes and good luck on your journey! Please be very well prepared!
Note that a lot have been very lucky bringing our recently acquired home and some have not...
http://www.steelsoldiers.com/showthread.php?150447-M1008-coming-home!-Sadly-not-today