RTN and ZTN front wheel difference

My 1941 RTN has a 6.0-12 front tire, mounted on a cast 12" solid wheel. I believe this is correct for this tractor, as the tractor is original and unrestored. Trouble is, I cannot locate a replacement tire for this wheel.
My 1948 ZTN has a 7.50-10 front tire, mounted on a 10" rim. I have an extra 10" rim and 6.0-10 tire, which could be used on the RTN.
Was the 12" wheel correct for the RTN and 10" for the ZTN, or were they mixed? These are original tractors and I'd like to keep them that way.
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My UTN has an airplane tire on it. fits and looks pretty original. Wouldn't tell unless you were looking close.

Not sure of the size but might be an option.
 
UTN 7.5 x 16. ZAN 7.50 x 10, ZTN 9 x 10. RTN shows a different rim RT5678. I have a 1940
RTN and put a new tire and if I remember fight it is a 12 in and is cast one piece.
 
I have a 1950 rtn that came from Montana and it needed a tire, and that was a 7.50x10. I was able to buy a new one from the local tire shop.
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(quoted from post at 14:37:26 08/04/16) I have a 6x12 , but Miller tire sells them new.

Thanks for the tip. I got one from Miller tire. Mot cheap, though. I have a new -unused 6.0 - 10 tire if anybody wants it. It will be too small for my ZTN.
 

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