The flange does go up, but on convertibles (which I seem to work on all the time) it is removed. The two pieces of the torque box weld to the upper seam area of the toe board and should fit fairly decent. I prefer to butt weld all my repairs but you can see the remnants of the spot welds in the second picture where it is welded to the top flange of the torque box. I also prefer using two piece torque boxes. Much easier to install.