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:
Fastener Tightening Specifications - Mirrors
Fastener Tightening SpecificationsApplicationSpecificationMetricEnglishInside Rearview Mirror2-Y18-lb-inOutside Rearview Mirror Bolts10-Y89-lb-inOutside Rearview Mirror Motor Screws5-Y44-lb-in ...