I just got an update from Miller Tire Company, and found that they are now supplying the 6-12 Firestone Town & Country Tire. These would be the exact tire replacement for the old 1963/64 John Deere 110's and for the early Cub Cadet Originals. Miller used to supply the Carlisle brand tire like this tread design a few years ago, which were really close, but these new Firestones are a dead match. Just thought I'd give you collectors the heads up. I wouldn't pay the asking price for them, $120.00 each tire + shipping, but I know there have been a lot of guys looking for them that will.
Currently, they have them listed on ebay. They might have them listed on their website as well, but I'm not sure. Also not sure if these tires require tubes or not. If so, I'd also bet that they aren't included with the selling price.
If any of you buy any of them, don't forget to post your opinions of them, or let us know how they hold up.