Forgot to mention I purchased the rear valence from Shelby Parts and Restorations http://s247533021.onlinehome.us/catalog/
It may be expensive but the problem I encountered in cutting one out was the aftermarket valences are junk to begin with and too thin. When you cut out the hole for the pod the valence is so thin the remaining metal cannot support itself and bends if you pick it up wrong. Shelby Parts and Restorations valence is a quality piece made from heavy gauge steel with the hole cut with a plasma cutter. Very little work was needed on mine to get it to fit perfect.