Installing new filler neck grommet...

I didn't need to boil mine. I used the DMT seal and just lubed it a bit. I did remove the three screws from the tube flange/body/cap so it could move a bit. A little painters tape held the pad till I got it over the tube and positioned. Suggest putting the driver side strap into the slot prior to putting the tank up. Passenger side was easy afterward on my B'cuda.