rear brake swap

[60apache4]

I have a 71 3/4 ton 4x4, with what I believe is an eaton rear diff (round pumpkin), and I it has a unique brake drum size of 11" x 1-3/4". No parts are listed in any books for this brake drum & shoe.

So, I was wondering if I could just swap in the backing plate from a Dana 60 to get the more common 12" x 2" brakes; cheaper and better brakes.

Your thoughts & ideas appreciated, short of swapping in a different axle with the right gear ratio (4.10), etc.

Thanks for your help.