Are you talking about the rear ball joint ? The kit above doesn't show that part and the kit arms have all the bushings pre installed.

I bought a ball joint press from amazon it worked ok. I smashed the thrust bearing using the tool to push some other bushing i think front tension strut but found reasonable replacement. Make sure the reviewers say it worked on your model X.

__________________
2011 E70 • N55 (me)
2012 E70 • N63 (wife)