New member to the forum so I hope I get this right. Just got a 2006 Red Mustang V6 convertible and have started doing a couple of mods. I recently found the forum while looking for a Mustang GT grille conversion kit. I bought from t2auction on ebay ( Tops & Trends ) and could not be happier. I also tried to contact Charlie at West Coast with ZERO success. The Tops & Trends grille arrived quickly and was packaged well. The install was easy enough and looked great when done.
As for the harness, a friend (who had already purchsed a Ford grille) got the GT switch, harness and instructions from t2auction on ebay as a stand alone item. It is not listed, but if you send them an e-mail I am sure they can probably help you out. He originally purchased the street scene harness only to find out it did not include the GT switch and was not DOT legal. I hope this helps.