2003 - 2004 - 2005 - 2006 - 2007 Chevy GMC Silverado, Colorado, Express Van, Canyon, Sierra, and Savana Factory OEM AM FM Radio. Part Number: 15131157 Compatible Part Numbers: 15198093 / 25916154 / 15756185 Option Code: UM7 *This radio requires dealer turn-on but is able to be put into a fully functioning test mode for 10 minutes at a time upon installation. Any GM dealer can unlock the radio and it is literally a 5 minute process. Most dealers charge anywhere from $75 to $100 but some will do it free of charge if you have a good relationship with them. Please make plans before purchase. If you have any questions, feel free to give us a call. * This is for a Chevrolet GMC truck and van factory OEM AM FM Radio that has been professionally remanufactured. This radio has been cleaned, serviced as needed and thoroughly checked. Part number is 15131157 with option code UM7 so please make sure this is the correct radio for your vehicle. Please note that this radio will need to be unlocked by a GM dealer upon installation. Please confirm: that this is the radio your vehicle requires as some of the vehicles on the chart used more than one style of radio. Feel free to give us a call with compatibility questions.