74 duster fenders ?

Its all about how the grille bolts up. The 70-2 have a little bracket where the grille support mounts to. The 73+ do not have that provision. I have not noticed any other differences between the 72-76 fenders. Other than the bracket, the markers set the 70/1 apart with different markers.

Top pic is a 72 and middle is a 70 and the bottom brown car is a 73