I guess that's what they are called. It only took all day but I removed the drivers side cardboard valence. I had to replace the section of it closest to the firewall as the electric fuel pump and Allison ignition box are mounted there. I have some old aluminum around so I used the old piece to make a pattern and cut out the section I needed. Used my Mouse sander to clean up the aluminum a bit. I also made a tube brace to help support the forward end. All in all I'm happy with it for now.