On my sons 72 Dart we put 75 Dart front disc on it with the larger 4.5 bolt pattern. On the back I had an 8-3/4 rear from a 67 Cuda I put in it and we had the local machine shop drill the axle's 4" to the 4.5 pattern. Its had the drilled axles in it since 1997 and they are still in it. Been raced many times over the years and they have held up fine. Ron