1998 and 1999 Cadillac DeVille AM FM CD Cassette Radio - GM Part Number: 09354796 - Option Code: UM5 - This listing is for a factory original OEM Cadillac radio used in DeVille vehicles between 1998 and 1999. The fitment listed should be used as a starting point only as this unit will only work if your vehicle came with this exact part number from the factory. Cadillac radios utilize a data stream and are not interchangeable or upgradable. If you do not have this exact partnumber currently in your vehicle, it will likely NOT WORK. If you are unsure of your part number, give a GM dealer a call with your VIN andthey should be able to provide you with the correct part number. After installation, this radio will need unlocked by a GM dealer. Most chargearound $50 but depending on where you live, it may be more. Please make plans before purchase and feel free to call around for the best price. It is a 5 minute process so don't let them tell you differently!