Specification Brand : Torque BulletPoint1 : QUALITY - Easy to identify part number permanently engraved on the rubber. 4.5 - 5.00 mm thick rubber that exceeds OEM requirements. 25% stronger 4140 grade steel studs. Stronger composite pistons. Highest leak test ratio after final assembly. BulletPoint2 : SPECS - Extended Height: 18.00" // Compressed Height: 7.50" // Top Plate Width: 9.00" // Piston Width: 9.50" // Weight: 13.40 lbs BulletPoint3 : REPLACEMENT FOR - Firestone W01-358-8813, W01-358-9069 // Goodyear 1R12-069 // Peterbilt 02456, 04759, 06746 // Triangle AS-8312, AS-8577 // Automann 566.ER8813 // AS8813, HDV8813, HD8813 BulletPoint4 : WARRANTY - Thanks to our superior quality and customer service we started offering our customers industry's first 3-year unlimited mile warranty on our rolling lobe / reversible sleeve air springs. When you get your air spring, please register it through Torque Parts website. BulletPoint5 : FITMENT - Please, call your dealer and ask for the part number. Then, check out if this air bag replaces it. Or, see the diagram picture and make sure all specs match with your air bag. ***Buying an air bag by make and model is one of the most common mistakes. Please, do not buy it by make and model.*** BulletPoint6 : Item Offered:2 Color : Please select it by part number ExternallyAssignedProductIdentifier1 : 0884879914916 ExternallyAssignedProductIdentifier2 : 884879914916 FinishType : silver FitType : Vehicle Specific ItemName : 2 Pack TORQUE Air Spring Bags Replacement For Peterbilt Air Spring Bags (Please select it by part number) ItemPackageDimensions_Height : 11.7 centimeters ItemPackageDimensions_Length : 2.7 centimeters ItemPackageDimensions_Width : 9.3 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : air-springs Manufacturer : Torque Material : Stainless Steel ModelName : TR8813 ModelNumber : TR8813 NumberOfItems : 2 OeManufacturer : Firestone PartNumber : 2 x TR8813_03_ ProductDescription : KEY FEATURES OF TORQUE AIR SPRINGS: - Easy to identify part number permanently engraved on the rubber. - 4.5-5.00mm trick rubber that exceeds OEM requirements. - Stronger composite pistons. - Highest leak test ratio after final assembly.