seat belts???

my 70 has no remnants of seat belts whatsoever.....i got pulled over one time and the cop was asking abou them. I told him i got through inspection just fine i didnt see a problem??? So whats the deal with mine? Were they originally in there?
 
Required after '66 I believe. Anyway my '67 coupe, which came with only the 289 and an AM radio as options when my grandparents bought it, has seat belts in all four places. The rears would not require much work for someone to have removed; they don't have retractors or anything, just four bolts holding four strips of webbing in place, with the adjustment at the buckle.