Note the extra piece of wood (thanks Lowes) I can't take credit for that idea, someone else did if first but I tapped a few holes into the metal panel just above the window and then used that wood ( its actually a plastic fiber board but SHHHH....don't tell anyone) to help secure the headliner. I also wrapped a length of wire down and around the window rubber to lock the headliner in place. Neither are required if you remove the window of course.