I have a 74 Challenger, but am quite sure the quarters and drop offs are mated the same way. Maybe someone can chime in for sure. There's no flange required for the drop off and quarters sort of "lay on top of one another, mating along the lower edges. The valnce and quarters bolt togther with three tabs. If someone doesn't post cuda pics for you , i'll post mine - i just did my quarters. Good luck!