You'd probably be best to pose this question at the
Official Elderscrolls Forums. It might even be an idea to contact Bethsoft.
The reason I say this is because you likely run a serious risk of messing up your game if you install the wrong patch, and from what I remember it's not that easy to uninstall.
At a guess, I'd say you need the North American patch because the Morrowind North American patch also covers Australia, but this is something you'll want to be sure on before proceeding.
Here is the install order for when you do know which patch you require:
Morrowind
Tribunal
Bloodmoon
Bloodmoon Patch (you don't need the other patches, just the appropriate Bloodmoon one)
Oh, and welcome to Game Banshee btw. Even if we can't help you with this question, be sure to stick around if you feel so inclined, people here are pretty friendly
