Thank you, but my understanding is that the bows I need are 1 year only early 1971 Duster/Demon. 1970 Dusters used a cup style bow receiver. 1972 and up used a molded headliner. And all non sport style a body's would have a wider roof width. Thank you for responding though. I have a feeling these bows are going to turn into a nightmare on what should have been the home stretch for my build.