The wheels and tires on the tractor are original. The tires are in really bad shape (but do hold air). I found an exact tread match to the original here:
They are spec'd to fit rims 8.5"-10.5" wide and are listed as 22.5" tall. My current tires are 22.5" tall and just barely clear the rear of the mower deck. I can't tolerate anything taller. I'm concerned if I put the tires on a 7" wheel that is 1.5" narrower than the specified minimum that I'll end up increasing the height and hit the mower deck.
I did find barrels and centers to build wheels here:
If I go the route of building a wheel, I can make either width in any offset I need to make everything clear on the tractor.
I haven't had much luck finding the wider wheels in the necessary offsets off the shelf. I was wondering what Sears used for the 10.5 tires since finding used wheels seems to be somewhat easy.