The GP Store sells aluminum grill inserts for the four openings in the front facia of the GP. I understand that the top two grills mount rather easily using the existing mounting points. My question is what about the lower openings in the front bumper right near the fog lights? I dont see any screws or existing mounting points. Do I need to drill? If anyone who has purchased this kit can tell me how exactly these inserts are installed it would be very helpful.