You would think that you would get an answer with all the experts on here!
AU Falcon is the exact same compressor with the only difference being the the fixed mounting bolt sleeves on the U.S. ones are longer than the Aussie compressor.
Simple fix by making two 10mm aluminium plates, with two holes in each, to fit between the bottom of the AU compressor bolt sleeves and the Mustang compressor mount.
Use your original bolts and not the shorter AU ones.
Belt length doesn't change.
94-95 Mustang compressor.
AU Compressor.