I searched all over and the only stainless steel bug shields I could find are made by LUND. Unfortuanely, they don't make one for the Explorer or Sport Trac. Thus, I bought one of the plasticized chrome ones.
Check out SUMMIT RACING. I was in their McDonough, Georgia retail store yesterday and they have "REAL" stainless steel bug shields.....not the plastic with chrome covering.