What is this interior clip for on 69 Dart

Thank you guys, so two should do it then, one one each side of center? Oops, no I just went and looked and there are two thinner 5-6" long clips, pooked in two holes of the back roof area right now.
The two in the picture are only 2-1/2" long and heavier guage, say like .090". Here's what I just saw when I looked at the back window, those two long skinny clips. I looked up front and saw no holes, I looked in the center and no holes there either. Any other ideas? Thxs, Tom