Where goes this piece go?

Does it go between the trunk floor extension and tail light panel, right where the quarter panel wraps around the back?
I looked some more and I think you are right, but it is not made right for the 74 Dart. Why is it you have to modify every reproduction part to make it work, really frustrating. As I look some more the 1/4 panels are not made correctly either. At the rear the originals wrap around 90 degrees on to the tail panel. These Repops have a flange that sticks straight out the back instead of being bent 90 degrees to atach to the tail panel.

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