THAT THING IS COOL!! 
Keep us posted!
There are a lot of 6" tires available.. something close will work..
Like others have said try miller tire.. They prob don't have that size but can give you a substitution for a modern size
__________________
Jay
40 years of Using and playing with IH Cub Cadets!
Proud owner of the following:
Cub Farmall, Super A Farmall, Original, (2)70's, 72, 100, 102, 123, 105, 125, 127, 108, 128, 1450, (3)782's, Yellow 982, 1782, "Sam's" 2182, M Farmall and a #7 trailer
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