Here are the lamps that all 05-09 GT/V6 mustangs take.
High & low beam headlamp
H13 (9008)
H13ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
H13XV XtraVision Halogen - The Brighter Light
Parking light
3157LL
Front turn signal
3157LL
Rear Turn Signal
3057LL
Tail light
3057LL
Stop light
3057LL
High mount stop light
921
921ST Silverstar Signal Lighting: Complete the Look: Crisp, Clean, Style
921LL Long Life Upgrade: Up to twice the life of the standard lamp
Fog/Driving light
9145
9145ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
H11
H11ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
H11XV XtraVision Halogen - The Brighter Light
License plate
168
168LL Long Life Upgrade: Up to twice the life of the standard lamp
Back up light
921
921ST Silverstar Signal Lighting: Complete the Look: Crisp, Clean, Style
921LL Long Life Upgrade: Up to twice the life of the standard lamp
Front sidemarker
2825
2825LL Long Life Upgrade: Up to twice the life of the standard lamp
Rear sidemarker
2825
2825LL Long Life Upgrade: Up to twice the life of the standard lamp
Map light
2825
2825LL Long Life Upgrade: Up to twice the life of the standard lamp

High & low beam headlamp
H13 (9008)
H13ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
H13XV XtraVision Halogen - The Brighter Light
Parking light
3157LL
Front turn signal
3157LL
Rear Turn Signal
3057LL
Tail light
3057LL
Stop light
3057LL
High mount stop light
921
921ST Silverstar Signal Lighting: Complete the Look: Crisp, Clean, Style
921LL Long Life Upgrade: Up to twice the life of the standard lamp
Fog/Driving light
9145
9145ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
H11
H11ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
H11XV XtraVision Halogen - The Brighter Light
License plate
168
168LL Long Life Upgrade: Up to twice the life of the standard lamp
Back up light
921
921ST Silverstar Signal Lighting: Complete the Look: Crisp, Clean, Style
921LL Long Life Upgrade: Up to twice the life of the standard lamp
Front sidemarker
2825
2825LL Long Life Upgrade: Up to twice the life of the standard lamp
Rear sidemarker
2825
2825LL Long Life Upgrade: Up to twice the life of the standard lamp
Map light
2825
2825LL Long Life Upgrade: Up to twice the life of the standard lamp