If your after an Aussie who now lives in the states who concentrates on exports to Australia and Europe give Matt at Shermatt a call.
Import and Export of Muscle Cars and Antique Cars
I know and met the guy and he is as honest as the day is long. There are a good deal of Mustangs and the like in Australia have been sourced by Matt.
He is well known around the Mustang forums. He travels the USA if you find a car you want and does all the hard work and haggling. I bought a 66 Fastback through him and a couple of other little projects.
Just be careful with some of those import/exporters out there, they are shonks!
Cheers