If its a GJ73a I don't think you will have much luck from Australia mate. I called all the big wreckers and only one had a tank which I ended up buying and it was the last apparently. There are a few tanks on Yahoo Japan Auctions which I was thinking about buying. A workmate of mine gets a lot of parts for his car from this Jesse Streeter guy and says he's really good. http://jessestreeter.com/ I think you can even tell him what you are after and he can try and source locally in Japan from the wreckers etc. Probably worth a look if you don't have luck elsewhere.