Armrest install issue

Hope you guys can help, put the door panels on for the 69 dart and the drivers door armrest will not attached with the screws ....does not have a threated insert. From what I can see, it is just a round hole and the screw goes right through. The door was from a 70 or 71. Can anyone chime in if they have a clip on the 70 and up doors for the armrest. I thought they were all the same from 67 to 72 other then the exterior moldings. On my 69 it is a welded piece on a angle that the screws go into to secure the armrests. Any help would be great. Thanks