JB5 verses JB6 axle flanges Pics with measurements?

[jess t]

Does anyone have pics with measurements of 5 lug C1500 rear axle backing plate mounting flanges with JB5 and the same with JB6? Is it possible to have two identical axles with ONLY the backing plate mounting flanges being different? jess in ky

 

[Caman96]

I know on 6 lug the flange bolt pattern is square(3 3/4 bolt pattern) for JB6(11” brakes) and a rectangle bolt pattern for JB5(10” brakes). Might be similar for a C1500.