I am installing torque boxes in my '67 coupe. My floors are in new and solid. I have the CJ two piece boxes. One of the pieces is supposed to "mate" to the floor toe board area. My question is whether this piece of the torque box is really necessary. It would be a lot easier to just install the 90 degree-like piece of the box. Does the flat "mated" piece of the torque box truly add any additional strength?