Ted in Olympia said:On the doors there are screws on both ends that you get to from the door jams. In the middle there are either push in metal clips (71-72, pain in the butt) or plastic clips 73, I don't think you have to pull the door panels.
Ted in Olympia said:Well maybe I should not have replied, most of mine experience is with Eldorado.
The clips you have pictured is what holds on the door moldings on the 73-78 but the 71-72 has the steel clips that go through a hole, very poor design.
Thanks for thisRemove the nuts inside. You need to pull the door panel(s), rear side trim and trunk liner to reach them all.
Ask on the ModifiedCadillac forum (http://www.modifiedcadillac.org/forum) as I'm sure someone there has the body manual for those years. They can probably give the number of nuts you'll need to remove and other tips.