For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition
65 WarningReading Lamp Switch Pushbutton Replacement Lighting Interior Lighting Rear Reading Lamps
Reading Lamp Switch Pushbutton ReplacementCalloutComponent NamePreliminary ProcedureRemove the roof console. Refer toRoof Console Replacement.1Reading Lamp Switch PushbuttonProcedurePress tabs together and remove switch. ...