Beater...
Have you considered that bar you're designing... upon which you'll mount the lights... fabricating it in a manner so that it "plugs in", if you will, to the tow hook threads. That would be the only mounting point... and the part that screws into the tow hook bolt hole, the piece that will be mated to the bar... that mounting point (weld, bolts, nuts, whatever fastener) could be hidden or nicely finished.
No?
