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 WarningBrake Dust Warning
Warning:Avoid taking the following actions when you service wheelbrake parts:Do not grind brake linings.Do not sand brake linings.Do not clean wheel brake parts with a dry brush or withcompressed air.Some models or aftermarket brake parts may contain asbestosfibers which can become airborne in dust. ...