22" tires are difficult to find now, and can be expensive.
In my opinion it is not worth keeping the 22" wheels if you can replace them with tubeless wheels, 22.5" or 24.5" and the corresponding tires.
If it was for an original restoration then I suppose I would be looking for 22" tires.
I think several tire dealers advertise in the ATHS Wheels of Time magazine, that would be a start.
What truck is this for, and what are your plans for the truck?
Grigg