I have a 2002 C4 and want to install the front and rear bumpers from a C4S. I've ordered replacement bumperettes, a new tow ring cap for the bumperettes, the front bumper mesh grilles, the rear bumper lower grills, and the lip for the front bumper. Does anyone have experience massaging the rear bumper bar to make the C4S bumper fit? Have I opened up a can of worms?