For 1990-2009 cars

#### GM SPO Group Numbers

Application | GM SPO Group Number
--- | ---
Backup Lamp Bulb | 8.991
Backup Lamp Switch | 2.698
Daytime Running Lamp Control Module | 2.485
Daytime Running Lamp Relay | 2.485
Dome Lamp Bulb | 8.991
DRL Ambient Light Sensor | 2.485
Dome Lamp | 16.494
Front Door Jamb Switch | 16.494
Front Park/Turn Signal Lamp Bulb | 2.589
Front Side Marker Lamp | 2.575
Front Side Marker Lamp Bulb | 8.991
Headlamp | 2.725
Headlamp Bulb | 2.727
Headlamp and Daytime Running Lamp Relay | 2.485
High Mounted Stoplamp | 2.679
High Mounted Stoplamp Bulb | 8.991
Reading Lamp Bulb | 8.991
Rear Dome Lamp | 16.494
Rear Door Jamb Switch | 16.494
Rear License Plate Lamp | 2.700
Rear License Plate Lamp Bulb | 8.991
Stop and Tail Lamp Bulb | 8.991
Tail Lamp | 2.679
Turn Signal Lamp and Hazard Flasher | 2.892
Turn Signal Lamp Bulb | 8.991