Thanks for the clarification. I don't mind using a larger bore MC to match the larger calipers I have. Good to know there is another smaller option if needed.

At this point I've decided to use the 86828 rotor (came on my 2007 3500HD axle) fit on back of 14 a bolt hub.
This will require a bushing to adapt the approximatly 4.59" hub pilot to fit the approximately 4.83" bore in rotor.
Filling the gap as seen in this PICTURE

You could do the same bushing idea and rotor on the outside of your Eaton hub. Avoiding the countersunk screws. As far as machine work goes the bushing I figure is about as easy, and only have to do it once. I'd also be concerned about shearing the countersunk screws because they would try to take the torque if the studs don't fit the hoes in rotor. I suppose if the lug nuts are snug it might not happen, but it is possible.

Picked up hopefully the last 14 bolt rear axle I'll need today.
PICTURE
This one has the 3.73 gears I want and with luck the gears and housing are in good shape, disassembly, cleaning, and inspection will soon tell.

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-