Aftermarket Cadillac Sts replacement keys: 24 in-stock listings for model years 2004–2011, including key fobs, transponder keys, from $17.20. Common FCC IDs: M3N5WY7777A, M3N65981403. Match the FCC ID and part number on your current key, or use our free VIN lookup. Keys are not OEM and most need cutting or programming; eligible items can be returned within 90 days.