The small 10 bolt I refer to is what others call the late model motorhome wheels. They have 10 lugs on a 7.25" diameter bolt circle with a 5.25" diameter center hole.

This bolt patern is only available in 19.5" and some smaller sizes, nothing bigger.

Here is the link for the Accuride catalog, lots of good stuff in here. Pretty much if it is a steel wheel on a truck they make it, and if they don't make what you want you can't get it.
http://www.accuridewheels.com/completeversion.pdf

Then there is Alcoa they make nice alluminum wheels in many of the more "popular" sizes. I don't think they have any sizes not offered by Accuride. I have not found a good catalog for them on the net.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-