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Ensure Fit: In the upper left corner, select Year, Make and Model by clicking "Select your vehicle", and then click Check Fit. Fitment: 2006-2009 for Buick Lucerne 4.6L 2006-2009 for Buick Rainier 4.2L 2006-2009 for Cadillac DTS 4.6L 2006-2009 for Chevrolet Trailblazer 4.2L 2006-2009 for GMC Envoy 4.2L 2006-2009 for Oldsmobile Bravada 4.2L Part Number: 12574379 15097130 ADP10329201S Package includes: 1PC Secondary Air Injection Pump. As shown in the picture! Note: You will enjoy 1 year after-sales service warranty.