74 Duster interior help

I got a 74 Duster for my 16th birthday, 18 now. I've put most my time and money into restoring this thing with my father. I have looked every where, I mean every where, and I can not figure out how to remove the back sail panels. I don't want to force them out because I can't find replacements and really need to paint them. Any help on how I could uninstall them would be great. First thread by the way, don't know If I'm doing it right..