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 WarningWheel Alignment Measurement Wheels
Steering and vibration complaints are not always the resultof improper alignment. One possible cause is wheel and tireimbalance. Another possibility is tire lead due to worn orimproperly manufactured tires. Lead/pull is defined as follows: Ata constant highway speed on a typical straight road, lead/ ...