Just to add to this thread with other years, probably the same, but I have a 2003 Cavalier Sedan so here are the Sylvania numbers, and some numbers I got from another site of which I have no clue the name.
SYLVANIA'S SITE
2003 CHEVROLET Cavalier
High & low beam headlamp
9007
9007SU SilverStar Ultra: The brightest and whitest light.
Up to 50% brighter, up to 40% more downroad visibility
and up to 50% more sideroad visibility.
9007ST SilverStar: The brighter and whiter light. Up to
35% brighter, up to 30% more downroad visibility and up
to 35% more sideroad visibility.
9007EB EcoBright - Your Environmental Choice. Save
Energy - Save Money. Up to 25% brighter light. CO2
reduced 9 to 21%. Gas savings $2 to $19.
9007XV XtraVision: The brighter light for upgraded
performance. Up to 30% brighter light and up to 25% more
downroad visibility.
9007CB Cool Blue: The whiter light for style. Up to 25%
brighter light and up to 25% more downroad visibility.
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Parking light
3357
3357LL SYLVANIA Long Life miniature bulbs perform
twice as long as any standard miniature bulb. Designed for
durability, lower maintenance and greater safety.
========================================
Front turn signal
3357
3357LL SYLVANIA Long Life miniature bulbs perform
twice as long as any standard miniature bulb. Designed for
durability, lower maintenance and greater safety.
========================================
Rear turn signal
3057
3057ST SilverStar: The brighter, whiter signal light. Up to
30% brighter light, up to 20% whiter light and up to 10%
farther and wider.
3057LL SYLVANIA Long Life miniature bulbs perform
twice as long as any standard miniature bulb. Designed for
durability, lower maintenance and greater safety.
========================================
Tail light
3057
3057ST SilverStar: The brighter, whiter signal light. Up to
30% brighter light, up to 20% whiter light and up to 10%
farther and wider.
3057LL SYLVANIA Long Life miniature bulbs perform
twice as long as any standard miniature bulb. Designed for
durability, lower maintenance and greater safety.
========================================
Stop light
3057
3057ST SilverStar: The brighter, whiter signal light. Up to
30% brighter light, up to 20% whiter light and up to 10%
farther and wider.
3057LL SYLVANIA Long Life miniature bulbs perform
twice as long as any standard miniature bulb. Designed for
durability, lower maintenance and greater safety.
========================================
High mount stop light
912
912LL SYLVANIA Long Life miniature bulbs perform twice
as long as any standard miniature bulb. Designed for
durability, lower maintenance and greater safety.
========================================
Fog/Driving light
880
880ST SilverStar: The brighter and whiter light. Up to 35%
brighter, up to 30% more downroad visibility and up to
35% more sideroad visibility.
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License plate
194
194LL SYLVANIA Long Life miniature bulbs perform twice
as long as any standard miniature bulb. Designed for
durability, lower maintenance and greater safety.
========================================
Back up light
3057
3057ST SilverStar: The brighter, whiter signal light. Up to
30% brighter light, up to 20% whiter light and up to 10%
farther and wider.
3057LL SYLVANIA Long Life miniature bulbs perform
twice as long as any standard miniature bulb. Designed for
durability, lower maintenance and greater safety.
========================================
Front sidemarker
2825
2825LL SYLVANIA Long Life miniature bulbs perform
twice as long as any standard miniature bulb. Designed for
durability, lower maintenance and greater safety.
========================================
Rear sidemarker
194
194LL SYLVANIA Long Life miniature bulbs perform twice
as long as any standard miniature bulb. Designed for
durability, lower maintenance and greater safety.
========================================
Glove box
194
194LL SYLVANIA Long Life miniature bulbs perform twice
as long as any standard miniature bulb. Designed for
durability, lower maintenance and greater safety.
========================================
Map light
168
168LL SYLVANIA Long Life miniature bulbs perform twice
as long as any standard miniature bulb. Designed for
durability, lower maintenance and greater safety.
========================================
Dome light
906
906LL SYLVANIA Long Life miniature bulbs perform twice
as long as any standard miniature bulb. Designed for
durability, lower maintenance and greater safety.
========================================
Trunk/Cargo area
906
906LL SYLVANIA Long Life miniature bulbs perform twice
as long as any standard miniature bulb. Designed for
durability, lower maintenance and greater safety.
========================================
The applications presented in this replacement guide have
been compiled using the best information available from
the vehicle manufacturers at the time of your search. This
guide is intended for general information purposes only,
not to be construed as any type of warrantee as to any
particular application. For specific applications the vehicle
owner's manual should be consulted.
When two or more lamps are listed for the same
application, remove the lamp and check the numerical
designation.
========================================
SECOND SITE, A BIT MORE COMPACT
Low Beam Headlight Bulb Size: 9007
High Beam Headlamp Light Bulb Size: 9007
Parking Light Bulb Size: 3357LL
Front Turn Signal Light Bulb Size: 3357LL
Rear Turn Signal Light Bulb Size: 3057
Tail Light Bulb Size: 3057
Stop Light Bulb Size: 3057
High Mount Stop Light Bulb Size: 912
Fog/Driving Light Bulb Size: 880
License Plate Light Bulb Size: 194
Back Up Light Bulb Size: 3057
Front Side Marker Light Bulb Size: 2825
Rear Sidemarker Light Bulb Size: 194
Glove Box Light Bulb Size: 194
Map Light Bulb Size: 168
Dome Light Bulb Size: 906
Trunk/Cargo Area Light Bulb Size: 906
Low Beam Headlight Bulb Size: 9007
High Beam Headlamp Light Bulb Size: 9007
Parking Light Bulb Size: 3357LL
Front Turn Signal Light Bulb Size: 3357LL
Rear Turn Signal Light Bulb Size: 3057
Tail Light Bulb Size: 3057
Stop Light Bulb Size: 3057
High Mount Stop Light Bulb Size: 912
Fog/Driving Light Bulb Size: 880
License Plate Light Bulb Size: 194
Back Up Light Bulb Size: 3057
Front Side Marker Light Bulb Size: 2825
Rear Sidemarker Light Bulb Size: 194
Glove Box Light Bulb Size: 194
Map Light Bulb Size: 168
Dome Light Bulb Size: 906
Trunk/Cargo Area Light Bulb Size: 906
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Hope this helps, I didn't compare with the above years so don't flame me if the replacement bulbs are the same for all Cavaliers; Just figured I put the sizes up for third gen Cavaliers wether the same or not so owners will know. Take care all - Tom