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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.- 25% stronger 4140 grade steel studs.- Stronger composite pistons.- Highest leak test ratio after final assembly.REPLACES:Hendrickson C-28929, S-28929, Firestone W01-358-9978REPLACES:Hendrickson C28929, S28929, Firestone W013589978REPLACES:Firestone 9978SPECIFICATIONS:Extended Height: 18.00"Compressed Height: 7.90"Top Plate Width: 9.00"Piston Width: 10.16"Weight: 15.10 lbs