radders and
to Aussie Pinball !
I have a Bally Ro Go in my collection and I really like the game due to the artwork. Bally EM parts can be found, but you most likely will have trouble locating machine specific parts such as plastics. It is a VERY rare machine. If it is the WA based eBay pin - I think it is a project pinball more than a working game, so you will need to roll up your sleeves ! Will most likely be missing chimes.
Best of luck with the purchase.