The NOS doors are all without the holes in the door frame for the vent windows. I think the best way to tell the exact year of application is to first check the hold for the lock knob to see if it's a '68 - the knob is back farther than the '69+ models. Next, if it's a drivers side, check for the ribs where the blue label gets affixed, if they are missing then it's a '69 door, if present then it's a '70+ door. Next, check for the crash bars inside the door, if they are present then it's a '74 - maybe a '73?? The NOS doors will have bolt on hinges if my memory is correct, but they can be used with a car with weld on hinges.
M