I put an AMD panel in my 69 about 5 years ago, and it didn't have holes either. At the time, I was told that my choices were with the two tailpipe extension "slots", or without them. It took a while to figure out backup light housing placement.
Guess I got lucky with my timing, when I started in 2012 they only had quarter skins as well! I got full quarters. My body guy was a bit slow but maybe knew more than he told!