1971 dodge dart swinger

my computer blew up, this is my girlfriends computer, now i got to find a way to post pictures, because i have an issue..well now the front fenders bumper and grill came off the car, i brought them home to my apartment only to first discover the undercoating on the drivers side fender looks smeared on while the passenger side looks spattered like the way the factory does it. i noticed a difference in the fender extention studs when i tried to take them off while they were on the car, now that i have room to pry away the cakes on undercoating to remove the 1/2 inch threaded nuts...i discover along with the factory undercoated fender..a fiberglass fender extention...and with the smeared seemingly replaced fender...i die cast pot metal fender extention. casted externally exactly the same, inside the studs and all are indeed completely different but painted and on the car..you would never know the difference. OH also the accused replaced driver side fender.. the indentation that allows the side marker light to sit in is real shallow while the factory fender has a real 90 degree deeper ridge. i will post pictures when i can..but can anyone explain where a cast metal extentionn comes from? do 1970 darts have a metal piece? or was the fiberglass one the replacement? thank you