1) it's not a rear lip, it's two seperate pieces the screw/stick on to the bumper on each side just behind the rear wheels.

2) The 4dr sideskirts should be 4 PIECES (2 each size), remember there is a door back there so they are not made like the real oem optional sides...otherwise the door would not open. It has two seperate piecs that screw/stick to the door that give it the appearance of the real oem optional sides. That would look rather goofy on a coupe