FORD LINCOLN MERCURY OEM 6 DISC CLIP OR MAGAZINE. PART # IS F8VF-18C833-AE.  THE LAST 2 LETTERS COULD BE AD OR AE THESE ARE THE SAME. 

WILL FIT VEHICLES LISTED BELOW(YOU MUST HAVE THE LONG GRAY EJECT BUTTON ON YOUR CHANGER FOR THIS TO WORK NOT THE ORANGE!)  note that there are actually two different types of eject gray buttons, the other one is smaller and this cartridge will not fit those changers with the smaller button 

1997-1999 Ford Expedition

1998-2001 Ford Explorer / Mercury Mountainer

1998-2002 Mercury Villager

1999- 2002 Lincoln Navigator 

1999- UP Will fit factory installed Ford Cd changer in Ford expedition,explorer, mercury and lincoln vehicles. 

Cd changer is in the center console (gray eject button with the letters eject )

Ford F-150 Super Crew.

compatible cd changer #'s

XW1F-18C830

1F1F-18C830

F8VF-18C830

3W7T-18C849

3F1T-18C830.

Thank you for looking.