1998 - 1999 - 2000 - 2001 - 2002 Cadillac DeVille Eldorado & Seville AM FM CD Cassette Radio. RDS Ready & Bose Compatible. GM Part Number: 09374516 Option Code: UM5. This is for a factory OEM Cadillac Bose radio used in DeVille, Eldorado, and Seville vehicles between 1998 and 2001. This unit is being sold as a replacement radio only and will only work if your vehicle came with this exact part number. This radio is being sold as a REPLACEMENT ONLY! Cadillac radios utilize a data stream and are not able to be upgraded. If you do not have this exact part number 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 and they should be able to provide you with the correct part number. After installation, this radio will need unlocked by a GM dealer. Most charge around $50 but depending on where you live, it may be more. Please make plans before purchase for the best price. It is a 5 minute process so don't let them tell you differently! Please contact seller with fitment or function questions.