Seems you don't have to convert it to RHD I'd be suprised if you have to comply to any other Australian rules like windscreen ??? Are you sure you need amber tail lights ??? Which state are you going to ? If its the NT I wouldn't even worry about it. They dont even have speed limits there.
So you thought CrossOver were expensive..... Get use to it ! You forget your driving a $50K car down here

If I were you I'd bring in some stuff in the trunk of your car and sell it. You could make some good money. (Ford Racing gears and manifolds etc....)
Ok... Late model Parts suppliers....
Mustang Australia - Tel :+61 2 9438 5300 (I find them expensive)
CrossOver - Tel : +61 3 9753 5822 (Reasonable price if you know them !)
Mustang Country Down Under - Tel : +61 3 5422 2703 (Really nice guy)
Mustangs R Us (Graham Folwell) - Tel : +61 3 9752 9081 ( Ask for Graham - Super guy) If he can't help you ask him for Rosco's number.
Thats all the numbers I have here at work. Let me know if they are no good and I'll go through my "black book" at home

I also know a guy who is parting out a couple of 95 and 98's.
Finally, I'd join your local Mustang Club. There won't be many late models but they will still be able to help you out. Plus you get to cruize with them !

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1995 Mustang GT - Vert
RHD Conversion, Vortech V2-SQ, 42# injectors, CAPA Chip, 18" BonSpeed Wheels, 3.73 Motive Gears, AutoMeter Gauge Pod, Pedders Springs, Koni Shocks, 13" Cobra Brakes, BBK Shorty Headers
~~ He Who Dies With The Most Toys Wins. But Is Nonetheless Dead ! ~~