I talked to the guy a CI yesterday and he really couldnt say why the 71 Duster has either 4 bows or six and they only sell a 5 bow set that fits neither one.I was trying to use the 5 bow set #MP19001, and just make the rear bow,but they don't work like that either,because the car isn't made to take the same clips as most mopars.There's no openings for the clips to go into.So now I'm trying to make bows to fit it,and they'll hook into the top like chevy and ford bows.Having a hard time figuring the length to make them and have enough to make the hook on the ends.