I believe the "hooks" you're holding in your hand are what hold the shoulder belt up on the roof. The coat hooks go in the back of the car, not over the door glass if memory serves me. Headliner will tighten up with steam, not sure if it will tighten up as much as yours is showing... I've got a couple of small wrinkles in mine, but they weren't very big to start with, and they steamed most of them out. Likely my fault as I installed the 3 point harness later, and that's where the wrinkles are. Not big enough for me to worry about, however my car isn't perfect. Continued good luck!!