Thank you for putting these install videos together. They are a huge help. Can you please give a bit more detail on the install of the header seal? Should the bulb portion of the seal be flush with the shell, or should it be sticking out a bit? If it is to protrude a bit from the front of the shell, approximately how much? The seal itself has a "ridge line" running on the back side. Should that ridge be pushed up against the back wall?