For 2001, here are all of your options,,,,
4 Dr, Sport Trac, AM-FM-CD (6-disc, in dash), ID YL2F-18C815-FF
4 Dr, Sport Trac, AM-FM-CD (6-disc, in dash), ID 1L2F-18C815-BA thru BD
4 Dr, Sport Trac, AM-FM-CD (6-disc, in dash), ID 1L2F-18C815-LA
4 Dr, Sport Trac, AM-FM-CD (6-disc, in dash), ID 1L2F-18C815-LB
4 Dr, Sport Trac, AM-FM-CD (6-disc, in dash), ID YL2F-18C815-GD
4 Dr, Sport Trac, AM-FM-CD (6-disc, in dash), ID 1L2F-18C815-MB
4 Dr, Sport Trac, CD changer, ID 1F1F-18C830-AA
4 Dr, Sport Trac, CD changer, ID XW1F-18C830-AB
4 Dr, Sport Trac, Amplifer, ID 2L2T-18B849-AB
4 Dr, Sport Trac, Amplifer, ID 2L2T-18C808-AB