Try Fairchild. I have gotten window sweepers from them before. (The pieces that go along the inside & outside of the side glass that attach to the door, sometimes called "cat whiskers") They were for a 69 D200 I had. They looked, fit & worked beautifully, so I would think they have them for a Demon, Dart Sport or Duster. (should be the same?) Metro & Restoration Supply may have them also. I'm sure someone makes a quality set.