There were two (2) in WA, Ian Diffen then Brian Smith, and Craig Marsland had one.
I understand the Diffen car is in Q.
To pursue the current whereabouts of both cars can I suggest you checkout a great WA motor sport site: http://www.speedwest.net/forums/forums/ubbthreads.php
Ask a question of the locals, they are friendly, and if you search the photo threads you will photos of both cars.