Try GMC, if you have not already?
I half think I have seen those 10 on 8.75" wheels on a ford, but I did not want to say anything because I was not sure, and have not found the answer yet.

Grigg

•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-