So what do ya do, drill the valance?

It looks like you can't get a nut behind the panel.(talk about a nut behind the wheel)

I was told by a guy that ownes a few second gen cars that he uses self tapping. No wonder every other '70 or second gen Camaro has no rear bumper brackets... I really don't want in to be a mickey mouse deal. What a pain in the backside this has become. Thanks for the comments guys.