I've seen for sale a Trailblazer front bumper that was specifically being sold for Envoys, it had the lower openings on each side surrounded with silver or chrome and the lower grille opening had tiny projection-like lights, I assume fog lights. Was this something that was a custom piece, or was it a stock piece made to make you think it was custom? Was this from an SS or ? and it was interchangeable between TB & Envoy? Anybody know? And do the openings allow ducting to be installed on the one side to connect to the air filter box? See what I'm getting at here? Thanks for any info..