The grill lights were simply high beam headlights for the car...i.e. standard high beam lights. The grills and some of the accompaning parts are available from Branda but I dont believe the headlight buckets are available new...they were from a '61 Galaxie I believe and are hard to find...I think they were used because they were flat in the back and could be screwed to the brackets where a normal bucket was round in the back and not useful in this situation...makes more sense if you look at a '67 Shelby in person. I think you could rig something up since you are probably not concernced with concourse correctness and no one would be the wiser by getting some ideas from a '67 Shelby.
Good luck.