There are a few differences between 70, 71 & 72 -74 front valance pan. The 72 - 74 has mounts added on the 3 brackets that attach it to the car. These are for the lower grille piece. There are 2 mounting provisions added to the front lip of the pan also. Other mounting holes, for the molding, were just enlarged on the 72 - 74 pan. The orange pan is a 70, 71; the other a 72-74. You could mount the newer molding on the 70 - 71 pan. You would have to add mounts to mount anything else. For a stock look a 72 - 74 pan could be used on any Challenger. A 70 - 71 would work the best on a 70 or 71 Challenger.