I don't know if this has ever been posted, but I thought it might be helpful...
2007 CHEVROLET Cobalt Lighting Chart
High & low beam headlamp
9007
9007SU Silverstar ULTRA for Ultra Night Vision - The Whitest and Brightest Halogen
9007ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
9007EB EcoBright - Your Environmental Choice
9007XV XtraVision Halogen - The Brighter Light
9007CB Cool Blue Halogen - The Whiter Light
Parking light
3157LL
Front turn signal
3157LL
Rear turn signal
3157LL
Tail light
3157LL
Stop light
3157LL
High mount stop light
912
912LL Long Life Upgrade: Up to twice the life of the standard lamp
Fog/Driving light
H11
H11ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
H11XV XtraVision Halogen - The Brighter Light
License plate
194
194LL 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
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
Map light
2825LL
Dome light
562
Step/Courtesy light
212-2
Trunk Light
194
The above info is for a 2007 Cobalt...I think they are all the same, but here is the catalog link to look up your particular year (or any other vehicle):
OSRAM SYLVANIA - Replacement Guide - Start
2007 CHEVROLET Cobalt Lighting Chart
High & low beam headlamp
9007
9007SU Silverstar ULTRA for Ultra Night Vision - The Whitest and Brightest Halogen
9007ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
9007EB EcoBright - Your Environmental Choice
9007XV XtraVision Halogen - The Brighter Light
9007CB Cool Blue Halogen - The Whiter Light
Parking light
3157LL
Front turn signal
3157LL
Rear turn signal
3157LL
Tail light
3157LL
Stop light
3157LL
High mount stop light
912
912LL Long Life Upgrade: Up to twice the life of the standard lamp
Fog/Driving light
H11
H11ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
H11XV XtraVision Halogen - The Brighter Light
License plate
194
194LL 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
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
Map light
2825LL
Dome light
562
Step/Courtesy light
212-2
Trunk Light
194
The above info is for a 2007 Cobalt...I think they are all the same, but here is the catalog link to look up your particular year (or any other vehicle):
OSRAM SYLVANIA - Replacement Guide - Start