Are you talking about where you fix the centre of the bar to the car?
Common way to do that is to take the rear shock tower off, carefully cut a thin slot into the back of the plastic where the rear shock tower attaches (I used a junior hack blade and cut it in by just a touch deeper than the bar thickness, and positioned it between the upper and lower fixing holes) and use the rear shock tower to hold it in.
Not going anywhere then!!!
There is also a thread with pics of this method from one of the team guys in the X Factory section if you have a bit of dig about
