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Automatic Belt Tensioner Air Conditioning fits for: Chevrolet Trailblazer 5.3L 2006-2009 Chevrolet Trailblazer 6.0L 2006-2009 Chevrolet Trailblazer EXT 5.3L 2003-2006 OEM: 12580196, 12565372, 12580196 (GM)