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 | 11.927
Front Door Jamb Switch | 11.950
Front Park/Turn Signal Lamp | 2.585
Front Park/Turn Signal Lamp Bulb | 8.991
Hazard Lamp and Turn Signal Lamp Flasher | 2.575
Headlamp | 2.725
Headlamp Automatic Control Ambient Light Sensor | 2.485
Headlamp Bulb | 2.727
High Mounted Stoplamp | 2.679
High Mounted Stoplamp Bulb | 8.991
Rear Compartment Courtesy Lamp Bulb | 8.991
Rear Door Jamb Switch | 11.950
Rear License Plate Lamp | 2.700
Rear License Plate Lamp Bulb | 8.991
Stoplamp Bulb | 8.991
Tail Lamp | 2.679
Turn Signal Lamp Flasher | 2.892
Turn Signal Lamp Bulb | 8.991
Windshield Header Courtesy and Reading Lamp | 11.927
Windshield Header Reading Lamp Bulb | 11.927