I would third the motion ,they look correct , I just remembered that I had a 69 el camino specific feature manual and checked it out .69 had spaces between the pleats on the seat like your covers have , the 71/72 covers did not have spaces ,the only discrepancy there might be is my picture shows one button for ever set of pleats (4 in total) on the upper part of the seat but of course I can't verify if these were on all seats .
Thanks guys! I'll pull the seats out this weekend. The issue I have is that it's like the seats are tilted too far forward - when I get in and out of the car, my legs hit the steering wheel. It's like the seat isn't not sitting level on the floor.