That info was taken straight out of the April 2005 issue of Bimmer Magazine, and I've also read on other websites of people doing it. The only difference that I'm aware of is that the outer ball joints are not replaceable on the E30 control arms. I believe this is why they're better than the E36 parts. The reason for using the E30 part is solely becuase the outer ball joint does not fail as much. Hope this helps
