2003 - 2004 - 2005 - 2006 - 2007 Cadillac CTS AM FM Radio CD Player. Dealer Turn-On Required. Part Number: 10387598. Option Code: U2R. This is for a factory OEM Cadillac AM FM Radio CD Player used in CTS vehicles between 2003 and 2007. The radio is in fair condition as seen in the pictures. The chart above should be used as a starting point only as 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 comes complete with free shipping and is guaranteed to be in 100% working order with a 90 day warranty. 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 and feel free to call around for the best price.It is a 5 minute process so don't let them tell you differently!