That is the correct P/N for the mailslot grille I did the conversion a few weeks ago.
http://www.camaro5.com/forums/showthread.php?t=68918
These are ALL of the part numbers you need to do the swap.
OEM SS Bumper cover $350 P/N 92236547
OEM lower SS grille, and mail slot grille $65 (Mail slot grille P/N 92242525, Lower SS grille P/N- 92218015)
OEM -P/N-92234403 (SS Front Air Dam Deflector Spoiler )
OEM-P/N-92238867 (Bumper/Fascia Emblem)
OEM-P/N-92238937 (Bumper/Fascia Emblem)