Actually, here is a shamelessly copied list of all the lights on the '07 classic.
2007 CHEVROLET Silverado Classic
Low beam headlamp
9006
9006SU Silverstar ULTRA for Ultra Night Vision - The Whitest and Brightest Halogen
9006ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
9006XV XtraVision Halogen - The Brighter Light
9006CB Cool Blue Halogen - The Whiter Light
High beam headlamp
9005
9005SU Silverstar ULTRA for Ultra Night Vision - The Whitest and Brightest Halogen
9005ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
9005XV XtraVision Halogen - The Brighter Light
9005CB Cool Blue Halogen - The Whiter Light
Parking light
3157NALL
3157AST Silverstar Signal Lighting: Complete the Look: Crisp, Clean, Style
Front turn signal
3157NALL
3157AST Silverstar Signal Lighting: Complete the Look: Crisp, Clean, Style
Rear turn signal
3157LL
Tail light
3157LL
Stop light
3157LL
High mount stop light
921
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
License plate
194
194LL Long Life Upgrade: Up to twice the life of the standard lamp
Back up light
3157LL
Front sidemarker
194
194LL Long Life Upgrade: Up to twice the life of the standard lamp
Rear sidemarker
194
194LL Long Life Upgrade: Up to twice the life of the standard lamp
Ash tray
161
Glove box
194
194LL Long Life Upgrade: Up to twice the life of the standard lamp
Map light
168
168LL Long Life Upgrade: Up to twice the life of the standard lamp
578
Dome light
211-2
578
Step/Courtesy light
194
194LL Long Life Upgrade: Up to twice the life of the standard lamp
74
Trunk/Cargo area
912
912LL Long Life Upgrade: Up to twice the life of the standard lamp
Under hood light
93
Daytime running light
4114LL