[ScottP]

The front track width was increased but only ever so slightly. Because the hubs
are just turned down stock rotors, the width increased by the thickness of the
hat section of the 330mm rotor, which is ~0.2" per side. I suppose if someone
wanted to duplicate this, they could take that much off the face of the hub/rotor,
as there is more than enough material there.

This setup should work with any 65-70 fullsize. The spindle assy was the same
whether the car came with discs or drums. The booster is just a stock 70 assy,
while the master is from a 94-96 Impala SS. I selected that unit a few years
back when I retrofit rear disc brakes from the same application. The single
piston D52 style caliper that came stock on my '70 is effectively identical to the
one that was used on the front of the '94-6 Bbodies, so it made that choice easy.