Torque Boxes and Subframe Connectors

I would check and see if AMD makes the torque boxes.

a search will turn up many opinions on subframe connectors. depends what your use will be. me, I just build drivers, and I make my own. I have used heavy square or rectangular tubing. 1 1/2 x 1 1/2 or 2 x 3. I don't incorporate it into the floor pan.