When I was working in the Pittsburgh area in the early '80's, I was able to find a complete hidden HL setup for my '68 Z24. I didn't know that the radiator support was "stamped out", so I had to do it to my own during re-installation. But I got the headlight switch, and even the two little pieces next to the running lights! It took me several hours to dismantle at the junk yard, but that was good because it helped me remember how to reinstall in my car. Of course, I replaced all the hoses/clamps.
Some years later, I removed all the verticals from the two grills; and had to do the same to the HL covers. Attached is a front view of my ride. The cost from the salvage yard: $50!!