[UN46] for 1991–1994 Ford Explorer.
[UN52] for 2001-2003 Ford Explorer Sport.
[UN105] for 1995–2001 Ford Explorer.
[UN105] for 1997-2001 Mercury Mountaineer
[UN152] for 2002–2005 Ford Explorer.
[U251] for 2006–2010 Ford Explorer.
[U251] for 2006 Mercury Mountaineer.
[U502] for 2011–2014 Ford Explorer.
[UW137] for Ford Excursion/Ford Excursion Stretched Limousine.
[U326] for 2007 Lincoln Navigator.
http://en.wikipedia.org/wiki/Ford_U_platform