I'll let you know if I spot any cheap axles. I search craigslist for "Dana 70HD" and "Dana 80" these will be 10 lug GM axles and not ford or dodge axles.

I think your front axle picture shows a hub with a drum bolted on, I don't think it has a dual wheel adapter.
Either way you could get some measurements and see what rotors may fit, then make a caliper bracket to suit. That would be great if it works out.

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-