Question about 1968 Dart shoulder belts

As stated above see if you can feel the anchor hole where the belt mounts first cause I was surprised to find no accommodation for shoulder belts on a 1968 GTS. I believe it was an early build (maybe Sept 67 ?). I agree that you would think ma mopar would have installed on all roofs in case they were ordered. Maybe they used up all old stock first in the pursuit of saving $$. Anyway that's what I believe I remember.