UNTESTED 05-06 Ford Mustang OEM Ford/Shaker500 Radio MP3 6 Disc CD Changer Player. Ford #5R3T-18C815-GB. Also has number: 28022513 on label. PLEASE NOTE: THIS HAS NOT BEEN TESTED. The unit looks to be in good condition overall. There are a few marks on it and a few of the buttons on the front of the radio are wearing off (please see pictures for reference).