I don’t know how many of them are actually built in Australia, mind, in the same way that many American cars aren’t built here (or are vaguely assembled from parts built elsewhere)
Holden was the only real one. And a few firms used to produce locally. Then the government didn't offer any subsidies to keep them on shore. They all shut down and left the country. Now everything is imported. Real shame. They were great pipelines of talent.