you have to notch the control arm.....if you are looking at the passenger side....you need to notch the left side of the control arm...and the drivers side you notch the right side of the control arm....but like james said...make sure to plate it back....I just cut the piece out with the plasma....and slipped it under where I cut and welded it back.....
Look at this profile.....he did his the same way I did mine.....
Http://www.streetsourcemag.com/Profile.aspx?ProfileID=21756