I have been chasing the same problem for 6 months. I was able to get my hands on the basic rim for the 19×700, but without the bevel and bead that allow them to attach to the wheel. Vintage Tire in PA. I found a welder who had access to a lathe that could turn them to shape after welding them in, but it was going to be tedious to do the weld without warping the rim. I wasn’t confident they could do it correctly, so I am still searching or other options. Coker used to make them, but they parted ways with the guy that ran their wheel fab shop. If you find someone to make them, I am interested in at least two.