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 WarningExhaust Manifold Heat Shield Replacement (LUV)
Exhaust Manifold Heat Shield Replacement
Callout
Component Name
Warning: Refer to Exhaust Service Warning.
1
Exhaust Manifold Heat Shield Fasteners (Qty: 3)
Caution: Refer to Fas ...
Starter Replacement (LUV)
Removal Procedure
Disconnect the battery negative cable. Refer to Battery Negative Cable
Disconnection and Connection.
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
If equipped with a front suspension skid plate, remove the drivetrain
...
Main Shaft Disassemble (Gen 1)
Table 1:
1st Gear Removal
Table 2:
1st Gear Blocking Rings Removal
Table 3:
1st and 2nd Gear Synchronizer Hub Retaining Ring
Removal
Table 4:
1st and 2nd Gear Synchronizer Hub and 2nd Gear
Removal
Table 5:
2nd Gear Bearing Remova ...