Keyless2Go New Uncut Replacement Transponder Ignition Car Key B112 This is a brand new uncut transponder key for 2003-2007 Cadillac CTS vehicles. A website link to free DIY programming instructions will be provided with every order. 1 original keys required in order to do self-programming. Otherwise you will need to get this key programmed by an automotive locksmith or dealership. Replacement for part numbers: B112, GMX320, 5912114, 12450813 CANADIAN VEHICLES: vehicles made for Canadian market do not have onboard DIY programming available and will require dealer/locksmith programming; please contact us before purchasing if you have any questions.