sedan quarter panel question

The wheelbase hardtop and sedans are all the same 111", don't know where you got your info?!? I have the rear section of a 69 Dart 4-door next to a rear section of a 69 Dart Swinger and the quarter panel sections are identical except of course the 4-door is shorter at the front for the rear door, but it can be used on a hardtop.