66stepside,
You will probably find it is cheaper to switch to 24.5" Daytons than to buy 22" tires. Accuride list those rims in the current catalog, so I bet you can get them new if not used, they would be a direct bolt on swap. I think you have asked about this before?
uncleb,
I could not find any at the antique truck tire places I could think of, at least not on their websites. Check a Wheels of Time for some possible sources, if you are not already an ATHS member, then now is the time to join, and you will get the magazines.
http://www.aths.org/I know there are some used ones out there, as my neighbor has two 22" tires on a rear axle he has, they are on decent aluminum wheels, but he said the wheels are scrap, because you can't get 22" tires. He will be running 22.5" wheels when he installs that axle in his service truck.
I also saw a KW a few months ago in a junk yard with a set of ten 22" tires on it.
You may have better luck in the junk yards looking for 22" tires than a tire store.
Grigg