There are 8 black 1/2 inch phillips head screws with a double washer along the vertical edges of the rear glass, as seen from inside the clamshell, 4 on each side. I have noticed one has fallen out, ALL 7 of the others were loose! Car only with 4K miles. Suggest everyone get their screwdriver and tighten them. BTW, anyone know how I can find a replacement??