http://bradken.com/careers/graduate-opportunities/graduate-cadet-online-application
Try my company - we don't do vocation work as such (it's just not called vocation work..) and it's not automotive (though, some of our plants do manufacture automotive components) - depending on what sites you put down you could be involved in component design, process improvement, project management, quaility control or manufacturing etc which will all relate back to the car industry.
There looking for people to put cadeships for final year too, so it may lead into a permanent job (i'm meant to be working with a team of ~10 engineers, of which their are currently 3-4 vacanciess...this is just my sub-division alone...so no shortage of jobs)