According to Ford, the 2010 GT and the 2009 GT share the same alternator part numbers (9R3Z10346B for manual and 9R3Z10346D for auto). It is different for 2008 back, and (obviously) 2011 forward.
2007 GT Premium, Redfire. CAI. Bama Tune. CMDP's. Pype-Bombs. 3.73's. SR 62mm TB. Remote trunk mod. 20% tint.
2010 Xterra Off Road. (The tow rig)
2008 Commander. Hemi. (wife won't let me touch it)