on a plymouth (duster/scamp/valliant)you need everything, hood, fenders, valances (upper and lower), bumper, hood latch and the brace that connects the upper and lower vallances. The only thing on darts Im not sure about is the hood.
The hoods are different also, the '73 hood is the same as the '69 Barracuda without a leading edge and the '70 - '72 has a hood the comes all of the way to the front with it's own leading edge.