For 1990-2009 cars

Application | GM SPO Group Number
--- | ---
Daytime Running Lamp Module | 2.485
Door Jamb Switch | 16.494
Fog Lamp Switch | 2.485
Front Park/Turn Signal Lamp | 2.575
Front Side Marker Lamp | 2.757
Headlamp | 2.725
Headlamp Switch | 2.485
Lamp/Dome | 16.494
Lamp/High Mounted Stop | 2.679
Lamp/IP Compartment | 16.110
Lamp/Underhood | 8.890
Lamp/Rear License | 2.700
Taillamp | 2.679