There are a good number of guys working on T's in Australia. Your quest might work better if you could physically have one in hand to look at. You could post over on The Model T Ford Club of America in the general forum. If you do post there, put that you are located in Australia in the title.
By the way, you can use your common Aussie terms for the parts, many know what they are.
As rotorwrench said, the teeth are straight cut and may or may not work for your application if the sizes are workable.