qtr install?

hi guys and gals i am working on finishing my 71 demon and i need some idea how to handle the lower part of the tail pan where it meets the qtr (replaced both qtrs with yearone re-pops). there are two wings that stick out to the the rear at both corners, looks like thay are there to fill the gap between the bumper. These where rusted off the car and not shure how to finish the ends. if you have a way to do this and or pick that would be awsome.