Mike, as you are gathering, the rules differ between all states and territories here in OZ.
If I was in your shoes, I would contact the people who will be saying yes or no, get in touch with SA Motor Vehicle Registry.
http://www.transport.sa.gov.au/index.asp
I would let them know exactly where your at with the car, ie is it a new build just registered?
Is it new and not registered, etc.
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Cruising in 5th
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Never be afraid to do something new, Remember, Amateurs built the Ark: Professionals built the Titanic.