I overlaid the image that Prafe posted onto my CAD drawing of the mudflaps, then just traced over the cutout and make a few small changes to make it a little better. Now the only other concern I really have is the mounting points.
Is there a set of mounting points on the cars and the original mudflaps, or are they just randomly screwed into the body? If that is the case I will just supply self tapping screws and washer with the mudflaps when I sell them.