I'll go out in a minute and see what I might scrape up for sources.
As far as size, the ground under a trailing wheel in a field is going to be irregular enough that 1/2" in radius isn't going to really mess you up. A more significant undersize could easily be cured by lifting the plow a notch or two if the smaller wheel lets it run too deep to pull. An oversize wheel, to my mind, would be more of a problem in that it might keep you from cutting as deeply as you want to, or tip the plow forward to where it's biting at a steeper angle than works well.
I'll look at some old catalogs and google a little on the tires and see what I can come up with and let ya know.
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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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