Demon quarter to tailpanel seam pic?
Tons of pictures in this how to thread
Duster to Demon Tail Panel Swap
As for the later Dusters being different they are, but, not at the quarter to tail panel seam. Tail panel to trunk pan yes, and tail panel to rear support brace yes, but the quarter to tail seam at the edge of the quarter is pretty much identical. The little corner pieces that connect the rear support to the quarter are different, but not the tail panel. Otherwise I wouldn't have been able to put a Demon tail panel on my '74 Duster.