OE Number of Serpentine Tensioner:12554027, 12580162, 88929140Fitment of Automatic Belt Drive Tensioner:for Chevrolet Express 1500 2500 2003-2008for Chevrolet Silvera 2001-2006for Chevrolet Silverado 1500 1999-2008for Chevy Avalanche 1500 2002-2008for Chevy Avalanche 2007-2008for Chevy Trailblazer 2006-2009for GMC Envoy 2001-2006for GMC Savana 1500/2500/3500 2003-2008for GMC Sierra 1500 1999-2008for Hummer H2 2003-2008for Isuzu Ascender 2003-2006for Saab 9-7x 2005-2009for Buick Rainier 2004-2007for Cadillac Escalade ESV 2002-2008for Cadillac Escalade/ Escalade 2002-2008Specification of Belt Tensioner and Pulley Assembly:Color: Silver Tone, BlackMaterial: Metal Total Size: 17x10cm / 6.69 x3.94 (L*W)Hole Diameter: 12mm / 0.47 , 13mm / 0.51 Include 1 x Accessory Drive Belt Tensioner Assembly.Feature of Belt Tensioner w/Pulley:Replace the old or broken belt tensioner to avoid noisy tensioner pulleys and no longer withstand belt noise.Achieve proper belt tension, and alignment, and ensure the good performance.Torsional round spring provides reliability and consistent tensionTake the tension off and pull the pin out after getting the belt in position.The tension force is automatically adjusted to make the transmission system stable due to the different tightness of the belt.Solid metal for wear resistance, not easy to break or deform, ensures longer service life.Please allow slight dimension differences due to different manual measurements.This is a non-OEM product, accessory only! Adaptable: [OE Number of Belt Tensioner and Pulley Assembly] 12554027, 12580162, 88929140 Trustworthy: [Fitment] Fit for Chevrolet Express 1500 2500 2003-2008, for Chevrolet Silvera 2001-2006, for Chevrolet Silverado 1500 1999-2008, for Chevrolet Silverado 2500 1999-2004, for Chevrolet Silverado 2500HD 2001-2008, for Chevrolet Silverado 3500 2001-2006, for Chevrolet Silverado 3500 HD 2007-2008, for Chevrolet SSR 2003-2006, for Chevrolet Suburban 1500/250 2000-2008, for Chevrolet Tahoe 2000-2006, for Chevy Avalanche 1500 2002-2008, for Chevy Avalanche 2007-2008 Detail: [Function of Belt Drive Tensioner] Replace the old or broken belt tensioner to avoid noisy tensioner pulley and no longer withstand belt noise, achieve proper belt tension, alignment, ensure the well performance. Item: [Features of Belt Tensioner w/ Pulley] Adopt with solid metal for wear resistance, shatterproof, not easy break or deform, ensure longer service life. Torsional round spring provides reliability and consistent tension. Tips: [Package] Include 1x Accessory Drive Belt Tensioner Assembly. Brand HEROFFIX Position Inner Item Weight 1.8 pounds Manufacturer HEROFFIX Package Dimensions 6.5 x 4.53 x 4.13 inches Manufacturer Part Number 004131herof240711