66 dart top help

your welcome.
the side pieces are easy.. the center compound curve piece... ehh not so easy. I have been to 6 fabricators and they all just say no. it's pretty much a stamped operation on a tooling die to get the correct curve. I'm still looking. I might make one from ABS if I can ever get caught up in my todo lists and just vacu-form it.
Actually while looking at your pictures and a quick daydream/brainstorm at work I thought of DIN strip. it's used in power supplies to install overloads and drives etc. But it comes in different profiles, just have to take measurements. I'll update if I come across something usable.