You'll have to go to a big truck shop, or a Rural shop that works on Farm Trucks, and Tractors, to find someone that will work with you, and those wheels. There's still a lot of these early model trucks, with these type wheels on farms. I've been running these trucks almost 40 years, and have never had trouble finding someone to change tires for me. Have these places you've checked with actually seen your wheels, or just listened to you describe them ? I'd still like to see close ups of them.