Here's a link:

https://www.cfitire.com/contact/



Note: I don't see their other location, down by the capital building, in Des Moines, Iowa.  I was there, about 12 years ago, to pick up a new combine rim for our 6620 sidehill. It was more of a wholesale area, and they build rims there, too.
They told me they had a machine that could bend and curve angle iron and that could be welded into that curved bead area (externally) on extreme applications, where even using thicker rim metal material, still wasn't enough to withstand certain abusive situations.
I know there was different metal thicknesses, when buying Ag rims. So some research and ask questions are necessary. (For our combine rim, our Goodyear dealer had already ordered it and I was just sent to go pick it up= Take a tape measure, they loaded a rim with the wrong backspacing, at first = I had our old rim's measurement with me and caught the problem before I left and they switched it out for correct backspacing, but it was painted white, instead of JD yellow)