OEM Transponder Key Fits Lincoln MKX MKZ MKT Navigator Town Car Mark LT LS Zephyr Aviator If you don't have 2 original factory working keys, but you still have one working key, you can take this new key with your actual working key to most locksmith shops or the dealership to get this new key cut and programmed to fit your car.&nbsp;Keep in mind that once you get this new key properly cut and programmed you will be able to use it with your actual working key to program more keys yourself. This key fits: Lincoln MKX (2011-2013) - Lincoln MKX (2011-2013) - Lincoln MKT (2010-2011) - Lincoln Town Car (2003-2011) - Lincoln Navigator (2003-2011) - Lincoln LS (2003-2006) - Lincoln Aviator (2004-2005) - Lincoln Zephyr (2006) - Lincoln Mark LT (2006-2008)