Thanks @Dana67Dart . That pic helps a lot and clears things up. My Demon does not have that gap, so I'm guessing that 1970-1972 Darts and Demons don't use it.
72 dart uses the same fender as your demon. I seam sealed that joint. I didn't see any evidence that it ever had the rubber piece.
#2 goes at the top of your inner fender splash shield where it meets the underside of the fender/innerfender
#3 goes along the fender edge of your inner splash shields
#4 is stapled onto the starter splash shield. It hangs below the DS frame rail. The rectangular opening is where your steering linkage travels through