WOULD IT BE A SIN

So, speaking of DOT and safety mandates? My 68 has (had) shoulder belts, front and rear. I’m not sure when shoulder belts were mandated, but is my car an oddity or is that normal?
January 1, 1969 so all 68s would have been optional. Some 69s were optional but after 1/1/69 head rest and shoulder belts were required (front).


Alan