Duster rear bumper question

I want to install earlier bumpers on my 75 Duster, I got a rear off of a 72 and the gap between the bumper and the body looking at it from the side does not look right. Do 73 bumpers fit better? I definetly do not want the Ralph Nader crash bumpers back on the car. I see that the quarters for 72 and 73 are different and I am wondering if that is why it doesn't look right. From the pictures I have it's hard to tell if the quarter has a cutout for the bumper.

Thanks