If you installed new sail panels with the headliner there should be a small indentation on the back side of the sail panel, I am gonna say about 1 inch from the top edge and about 1/3 of the way back starting from the front (the screw for the hanger goes through the top edge of the panel) that will give you a general idea of where they go. If not, you can feel through the headliner (with the sail panels removed)with your fingers, that particular screw hole feels like a horse shoe because that is also where the sheet metal will meet. If this does not help post and I will get you a picture tomorrow when I get home.
Ray