Seat belts were Federally mandated for the 1966 Model year....so you are wrong.skywalker said:chelle: I think it was '67 and later, but I've been wrong before. Either or, if you have '67 or latermustang then you should have seatbelts, if you don't there is an issue.

It is a production anomoly....sometimes they ran out at the factory and they were supposed to be dealer installed.....but some slipped though the cracks.Banditlead said:My 66 doesnt have seat-belts in front or back, and there is no sign of it ever having had them.....
kidtaurus said:I believe they were options prior to 68. But in 68 they became standard equipment along with smog control, and other safety/quality requirements thanks to Ralph Nader.