Thanks for the replies and the photos guys. Those definitely help. Admittedly, I have not removed the carpet yet, but the underside looks just like the internet photo shown, (even the sprayed on rustproofing) except I have TWO holes about 1.5" apart through the support bracket that goes toward the rocker. I'm going to measure both holes from the pinch flange, then compare to a friends 68 Charger R/T for reference. I assume the floor pans are similar for B bodies? (No Plymouth B bodies that I know of nearby to check...) Thanks again guys!