Well, I already have the signal problem solved, and it works great, so im not concerned about that. Plus, I figure that the back of the Audi A4 looks like the back of my car... so I'll make the front look more like an A4 front end, with no bumper lenses. Possibly someday i'll integrate some projector fog lights into the bumper, directly below my HID projectors, I love how that looks at night.
When I get my rust fixed this summer, and paint the car (same color) i'll have them fill in the holes for the lenses, so you'll never be able to tell there was anything there.