I cannot see it in any of my pictures. I'll see about getting some pictures for you. Basically at the bottom of the door there is a U shaped piece of sheet metal The bottom of the U would be the exterior cab underneath the door opening. Inside of this U is a piece of 1x4 it appears. Looks like it is there to support the floor (not the removable floor piece). You can really only see it if you look from under the firewall.