[ShadyJC]

Here is what is believed to be a complete and accurate list of all bulbs used in the FX.

First gen (2003-2008)
High & low beam headlamp (2 bulbs)
HID-D2S

Parking light/Daytime running lights (2 bulbs)
7443

Fog light (2 bulbs)
2003-2005 models: 9006
2006-2008 models: H8

Turnsignal (2 bulbs)
7440

License plate (2 bulbs)
168

Back up light (2 bulbs)
921

Front sidemarker (2 bulbs)
194

Rear sidemarker (2 bulbs)
194

Map light (2 bulbs)
DE3175

Dome light (1 bulb)
DE3175

Step/Courtesy light (4 bulbs)
DE3175

Rear Door Entrance/Map lights (2 bulbs)
DE3175

Trunk/Cargo area (2 bulbs)
DE3175

2nd Gen (2009+)
High & low beam headlamp
HID-D2S

Parking light
2825

Front turn signal
992 (7440A)

Rear turn signal
7440

Tail light
LED

Stop light
LED

High mount stop light
LED

Fog/Driving light
H8

License plate
2825

Back up light
7440

Front sidemarker
2825

Rear sidemarker
2825

Dome light
DE3175


Trunk/Cargo area
DE3175
7443