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 WarningSecondary Camshaft Intermediate Drive Chain Tensioner Replacement - Right Side Valvetrain Camshaft
Removal ProcedureRemove the engine front cover. Refer toEngine Front Cover Replacement.Remove the right bank secondary camshaft drive chaintensioner. Refer toSecondary Timing Chain Tensioner Removal - Right Side.Installation ProcedureInstall the right bank secondary camshaft drive chaintensioner. Re ...