For those using Sebring convert seats-how did you brace the floor pans.

I have a set of Sebring convertible seats but looking for ideas on how to beef up the floor pans for extra support since these seats have the integrated seat belts. Ultimately trying to hash out whether I go with the Sebring seats (already have modified seat tracks and holes drilled in floor pans but will need more supports) or have the 73 charger seats I just picked up get new foam, new hard back covers,recovered and run the old style lap and shoulder belts.