[Josh Grisdale]

Hi Sarah,

I don’t think it is associated with the car, but with the person in Japan. Here is the form and it only asks about the person, not the car: https://www.keishicho.metro.tokyo.lg.jp/tetsuzuki/kotsu/seido/jogai.html

You just need the form and a recent Juminhyo.

I got one for when I’m in the country and need a rental car.

Once you have that, you can likely get a temporary permit in Australia:

https://focusondisability.co.uk/disabled-travel-motoring-parking/disabled-parking-countries-outside-europe/

Hope this helps