Early Dart Headliner Install Question

Just installed a new headliner in my 1965 Dart 2 dr. I didn't have such "drive nail". I don't recall the listing going all the way down the sail panel section, but perhaps it did. There is a seam there. I didn't use that "drive nail", and don't recall it in the FSM so perhaps began in 1966. I have two clips which look similar which were for the package tray, at least in a bag I marked thus but found after I had installed that. They have spring fingers like the door panel clips, but a round flat button top, so perhaps what that drive-nail is. My sail panel boards had fallen apart, so I cut new ones from ABS sheet. I glued thin foam to each side so the panels wouldn't slap against the body (used packaging foam bag from electronics).

I similarly made a new package-tray shelf from ABS sheet, covering it with vinyl upholstery from Joann's Fabrics and cutting holes for modern speakers. I'll do similar for the rear side-panels, covering w/ the original vinyl. The front door panels are OK but need to reattach the vinyl since it shrunk and wrinkled.