Aftermarket Lexus Rx300 replacement keys: 5 in-stock listings for model years 1999–2003, including key fobs, from $19.60. Common FCC IDs: N14TMTX-1. 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.