Chevrolet light replacements/ Bulb numbers

Low beam headlamp

H4656
H4656ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
H4656XV XtraVision Halogen - The Brighter Light
H4656CB Cool Blue Halogen - The Whiter Light
H4656LL Long Life Halogen Upgrade: Lasts 6x longer

High beam headlamp
H4651
H4651ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
H4651CB Cool Blue Halogen - The Whiter Light

Parking light
1157A
1157AST Silverstar Signal Lighting: Complete the Look: Crisp, Clean, Style
1157ALL Long Life Upgrade: Up to twice the life of the standard lamp

Front turn signal
1157A
1157AST Silverstar Signal Lighting: Complete the Look: Crisp, Clean, Style
1157ALL Long Life Upgrade: Up to twice the life of the standard lamp

Rear turn signal
1157
1157LL Long Life Upgrade: Up to twice the life of the standard lamp

Tail light
1157
1157LL Long Life Upgrade: Up to twice the life of the standard lamp

Stop light
1157
1157LL Long Life Upgrade: Up to twice the life of the standard lamp

License plate
194
194LL Long Life Upgrade: Up to twice the life of the standard lamp

Back up light
1156
1156LL 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

Ash tray
1445

Glove box
1895

Dome light
211-2

Courtesy light
1004
1445
194
194LL Long Life Upgrade: Up to twice the life of the standard lamp
631

Trunk/Cargo area
1003
1003LL Long Life Upgrade: Up to twice the life of the standard lamp

Under hood light
1003
1003LL Long Life Upgrade: Up to twice the life of the standard lamp

Instrument-general
168
168LL Long Life Upgrade: Up to twice the life of the standard lamp
194
194LL Long Life Upgrade: Up to twice the life of the standard lamp

Hi-beam indicator
194
194LL Long Life Upgrade: Up to twice the life of the standard lamp

Seat belt indicator
194
194LL Long Life Upgrade: Up to twice the life of the standard lamp

Brake warning
194
194LL Long Life Upgrade: Up to twice the life of the standard lamp

Directional signal indicator
194
194LL Long Life Upgrade: Up to twice the life of the standard lamp

Radio dial
194
194LL Long Life Upgrade: Up to twice the life of the standard lamp

Excellent info!! I remember when I had my first '79 umpteen years ago, I could walk into an auto parts store and buy the bulb I needed simply by looking at it. You can't do that anymore with newer cars. I tried buying a turn signal bulb for my 89 Firebird using the visual and the car didn't like it which caused it to flash super fast. I had to go back and get the exact part #bulb so it would flash correctly even though visually they looked identical. I miss when cars were simple.