The 65 GTO I recently purchased does not have rear seat belts in it. In fact I do not see any bolt holes in the areas where they would be attached to the floor. The car does have the Factory Front Seat Belts. Would rear seat belts have been an option in 65? I know that seat belts were still kind of new to the scene in those years. I would have thought that the floor board would have had the holes in it in case the car was ordered with them. I am not sure how I can properly install them if there are no mounting holes for them.