Well I could never afford something like that. Only thing I can think of right off is to cut as much out of the back side, as long as it doesn't interfer with the window mech. Would heating up the center of the crease to a red hot and then doing some off dolly work then quench it with a spray of water start to level it out?? I did have studs welded to the center, but that slide bar wouldn't hold, and they kept breaking off, so I just gave up on it.