Applying Rubber to Full Steel Wheels

I am restoring my McCormick-Deering 22-36 and have decided to put rubber on my full steel wheels, rather than return the wheels to spade lugs and skid rings.
I am attaching am image of my newly-painted wheel and images of how various persons have applied their rubber.
I am asking this:
Where is the source of the rubber material? I would imagine I would go to a tire shop and inquire and perhaps to a shop that does retreads.
Any help or advice is welcomed.
Also, do any of you have any estimate of cost?

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The last paper catalog I have from Miller Tire (millertire.com) had flat rubber cleats that bolted onto the rim with carriage bolts, in a chevron pattern much like a conventional rear tread. May have been a Deere thing, but you might inquire of them if they have anything that might work.

What you're looking for isn't something you're going to go out and "buy by the foot". All these people have simply done is taken old tires and cut off the side walls and bolted the tread to their rims.

You can buy rubber cleats and also some companies makes rubber lugs but if you're wanting to go cheap just start cutting up some old tires.

Seth-We bought ours, by the foot, from a place in Algona, that recaps semi tires. For the fronts, we tried belting, but found it to be kind of thin, so we switched to car tire retreading material. Ours is the 15-30 shown in one of Tom's photos.