I did however have the rear axle flanges drilled for 4 3/4 on my 56 to match the front disc conversion.Fred
I have been considering having the rear axles drilled and wondered if someone had done this before. I already snagged the front hubs for 5 bolt but was not sure if making the rear match would require custom axles or what. Did you use care drums after re-drilling the axles for the new pattern? I just can't see re-drilling the drums as they would have more torsional stress in my way of thinking.