Hy ttodd, I did some research, it looks like the spindles {steering knuckles] definately changed for the 55B model, so I don't think your 56 stuff could be used without redrilling to the old spindle bolt pattern, you will probably have to make up some custom size spacers to make your 56 stuff work also. I would just look for some 53-55A backing plates and spindles. You never said if your 56 axle was a one ton axle or not. Hope that helps.
