I know that the 74 nova has what was called minor impact bumpers, and these were new in 74, the 73 didnt have the same set up, although the bumpers were the same on the outside, the 74 bumpers are alot heavier, front and rear. The 72 nova has the gas filler in the bumper, as the 73-4 has the gas filler in the taillight panel, you could still use the 72 bumper on the 74, but you couldn't use the 74 bumper on a 72.Not that you would want to. I have a 74 custom, but i never saw one with say 68-72 bumpers on it, but im pretty sure it could be done fairly easily.
Yes.
No
Yes
Not without modification. The 1973 and 1974 body styles are unique in the Nova series.
Yes
The bumpers for a 1972 Plymouth will fit a 1973 Plymouth duster with a little fabrication.
No
1974 was the first year of energy absorbing Beetle bumpers. You can't use earlier bumpers on 1974s.
NO, they are two different body styles
they should as they are the same body style.
No, they're 2 different grilles
Yes it will bolt right on.