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Genuine GM parts have one of these marks:

California Proposition 65 WarningLiftgate Adjustment
Liftgate Adjustment
Callout
Component Name
1
Liftgate
Caution: Refer to Fastener Caution.
Procedure
Loosen the 4 liftgate hinge bolts to adjust the liftgate.
Adjust the liftgate in order to obtai ...
Tire Dismounting and Mounting (Match Mounting)
Match mounting is required on any wheel/tire assembly not within RFV specification.
Important: If a wheel/tire assembly is not within the RFV specification
after match mounting, the tire must be returned to the tire manufacturer.
All wheel weights should be removed prior ...
Water Pump Replacement (LUV)
Water Pump Replacement
Callout
Component Name
Preliminary Procedure
Drain the cooling system. Refer to Cooling System Draining and Filling.
Remove the water inlet. Refer to Water Inlet Replacement.
Remove the water pu ...