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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: Freightliner 681-320-0017, A16-14004-000, A16-17574-001, A16-17574-002, A16-17574-001 and A16-17574-002, Firestone W01-358-9781, W01-377-8537, W01-377-8536, Goodyear 1R12-603, Contitech 910S-16A382, Triangle 8382 REPLACES: Freightliner 6813200017, A1614004000, A1617574001, A1617574002, A1617574001 and A1617574002, Firestone W013589781, W013778537, W013778536, Goodyear 1R12603, Contitech 910S16A382, Triangle 8382 REPLACES: Firestone 9781, Firestone 8537, Firestone 8536 SPECIFICATIONS: Extended Height: 23.00" Compressed Height: 8.75" Top Plate Width: 9.00" Piston Width: 10.62" Weight: 15.00 lbs