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:

California Proposition 65 WarningExterior Lamp Controls
The exterior lamp control is on the instrument panel to the outboard side of
the steering column.
There are four positions:
(Off): Briefly turn to this position
to turn the automatic light control off or on again.
AUTO (Automatic): Turns the headlamps on automatically at normal brightness, ...
Catalytic Converter Heat Shield Replacement (LUV)
Catalytic Converter Heat Shield Replacement
Callout
Component Name
Warning: Refer to Exhaust Service Warning.
1
Catalytic Converter Heat Shield Fasteners (Qty: 4)
Caution: Refer ...
Manual Shift Detent Lever with Shaft Position Switch Assembly and Park Pawl
Actuator Installation
Table 1:
Park Pawl Actuator Guide Installation
Table 2:
Park Pawl Actuator Installation
Park Pawl Actuator Guide Installation
Park Pawl Actuator Guide Installation
Callout
Component Name
...