There is a possibility that a Dana 60 from an E350 van has about the same width. It has the right bolt pattern, and I seem to remember measuring one that was about right, but don't take my word for it until you actually measure some.

You can have one built to your specs http://www.dynatrac.com/

You can find most any 3/4 or 1 ton with the right gears and bolt pattern, then have it narrowed.

What you want will not be easy to find.
If you have a flat bed and the wheels have more room then the width is less important and easier to find one to fit.

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-