This is a kit that comes with a 3d printed marking template to easily and properly locate the cut out on the leading edge. The 3d printed mount is bonded and optionally screwed to the inside of the leading edge. The lens is just about perfectly flush with the leading edge skin. There is a 1/8” reveal of the 3d printed mount that separates the lens from the leading edge skin. This reveal is also flush to the leading edge skin. I have installed these after paint with out any trouble, you do have to be precise with final fitting. If you currently have leading edge cut outs for legacy light mounts we can in rare cases scale up the 3d print to “surround” the old cut out. This will be obvious when the marking template is laid over the leading edge, call 4063664638 if there are any issues.