I'm glad you said that. When I was under my 66 Dart brainstorming exhaust mounting ideas, I figured the seat belt mounting holes would be really convenient. I may just do that using something like this for a hanger.
Yea that is what I used and worked well. I did use tti brackets mounted to the car. This is a complete tti exhaust system with headers. The back half of the exhaust was modified to clear my rear leafs as I have the springs moved in.