I remember a few months ago where I saw where someone had photos of the different styles with part numbers posted on Moparts web site. I'm not at home for several more days, so I can't help you with a photo of my original trunk emblem with a ruler for measurements. Hopefully someone else can help there. If not, I'll post mine when I get home. Found it from last August here. Let's see if I can do this.
https://board.moparts.org/ubbthreads/ubbthreads.php/topics/2533396/71-challenger-dodge-deckIt's in the last several replies.
Terry
