ABS Headliner
The one I have is tucked into the rear gasket but overlays the front gasket. I also trimmed a couple spots of the headliner in that back so it would fit better in the back.
Did you buy one that was already covered in fabric? I had to completely reglue the one that I have after the first round of 100* weather, the fabric sagged and almost completely separated. I re-glued it with 3m adhesive and haven't had issues since. I like the ABS headliner, but if I were to buy another I would buy a plain one so I could fit and trim it more easily and then add the fabric myself, since I had to glue it again anyway.