73 Dart Sport Rear Belts in a 71 Demon?

Well, I think I screwed myself either way. Looks like the lower seat bottom was notched for that retractable belt. This is an early build 71 Demon that does not have the notch.

I guess I will be looking for a complete 71 seat belt set. I thought I was doing the right thing, trial and error. Now I know.

Bill