2006 Lincoln Zephyr AM FM Radio 6 Disc mp3 CD Player w Navigation System. Part Number: 6H6T-18K931-AP. Identical Part Numbers: 6H6T-18K931-AD, 6H6T-18K931-AE, 6H6T-18K931-AF, 6H6T-18K931-AG, 6H6T-18K931-AH, 6H6T-18K931-AJ, 6H6T-18K931-AK, 6H6T-18K931-AL, 6H6T-18K931-AM. This is for a Lincoln AM FM Radio 6 Disc mp3 CD Player with Navigation System. This radio has been professionally remanufactured, cleaned, and serviced as needed and thoroughly checked. The radio's appearance is good with some wear on the buttons and the screen, as pictured, and is in 100% working order. This radio is being sold as a REPLACEMENT ONLY! The part number is 6H6T-18K931-AP. 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, contact us with your VIN and we should be able to provide you with the correct part number. They may look the same and have the same plugs but data streams may be different, not allowing them to code. For example, external amps are used in some cars and will not allow interchange, etc.