Miller's, as Hugh suggested, was the first place I looked. They have 4x12s in a conventional ribbed tire. But for a plow tire they have a 3.5x12 which I suspect is the same size tire you have. And that plow tire and its shape are a pretty specialized thing.
One question is, how old is the book you're getting your tire size from? You've been around tractors long enough to know how the size descriptions of the tires have evolved over the years. Though I've never seen a discussion of how that worked for implement or plow tires, I wonder if the same thing might be a factor here -- i.e., you might have just the right tire on there, just a more modern size designation.
Off to Gempler's next and then to some paper catalogs I have out in the garage.
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Today's Featured Article - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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