I may have my Demon confused with my '66 Dart, but don't the ends of the bows poke into little steel "pockets" that attach to the inside of the car? Don't forget the rear tension hooks for the last/first bow.
That's the way my 65 bows were set up, no clips involved. You're right, there are 2 tension hooks at the rear bow, they're nothing more than bent wires.