G'day Ed,
It appears that the the HU in your new car is already an aftermarket unit. A pair or single din "pullers" are used to pop the head unit out.
Some use paper clips, others recycle wire hanger provided by dry cleaners...just snip the left and right ends of the wire hanger (C or U shape), adjust a bit and it should suffice as a DIY single din HU removal tool...insert as a pair.
If you prefer an OEM stereo head unit, I have a spare Porsche-Becker CDR-220 (AM/FM/CD/AUX, etc) that will look "stock" without the bling factor.
I could have it arranged brought down under by mum in about two weeks. PM/EMAIL me if you have other questions and let me know if you are interested.
Have a good day mate!