What years are interchangeable as far as grills/grill shells go? I am including the lower grill/valence (with the parking lights) in my question as well. I have a 78 scout (at least that is what the vin number and door tag say), but along the way, it appears to have picked up a 75 grill. The grill and the metal upper grill shell are good, but the lower metal grill/valence is bent on one side and I was going to look for a good straight used one, but I need to know if I can just pick up any year (71 - 80) lower piece or if it needs to be year specific. Honestly, if I found a good deal, I would like to change the entire piece back to the correct 78 (or 79 from my understanding) grill.