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Is there somewhere I can go to find the official specification of all Australian models?

Mazda Australia had a webpage with limited info on their site around the mid 2000s, but after it disappeared about a decade ago, I don't believe they replaced it. Some screenshots here about 2/3 down page: viewtopic.php?f=76&t=30041&start=30
Other than that there is unofficial page on here: viewtopic.php?f=76&t=31669

If you can get the Glass guide they listed all models and standard specs and pricing but books usually only go back 10 years.

http://www.redbook.com.au is a good place to start.