I cut mine out like yours also. A cheap slide out blade cutter like wall paper hangers use worked best for me. When the blade starts wearing down you just break off an inch. Wear leather gloves! Our lower bumper grills don't lay flat. The bumper has a slight angled point to the center. I then put my grills in a clamp lightly, copying the same angle that they mount. With a drill press and I think a 2 1/8 hole saw (Over a year ago) I drilled thru the grills. Super glued in a 2" non pressure black PVC drainage coupling from Lowes. Make the center of your hole line up with the towe hook on the passenger side. Then copy for the drivers side. Looks like brake air ducts. Painted to match the cars color. Squirrel Crusher