Denny,
I feel your pain! That's why I started a thread in the one tons about the Excelsior tires. Yesterday I stopped in a rim manufacture to see about making a 19" rim for my truck. I came up with that measurement by the true diameter of my 17" rim with the bead and lock ring. I'm going to take an old 17" rim to him and see what they say. I know a lot of truck enthusiast would be interested in a period looking tubeless rim that would have the same overall diameter as the old rim and bias ply tire. Reaching for the stars but you never know until you ask