Firestone 8536, Freigthliner 681-320-0017, Firestone W01-358-9781, Goodyear 1R12-603) OEM W01-358-9781 Air Suspension Spring, air spring for trucks 910S-16 A 999, 1R12-603 Air Suspension system. Air spring, load-carrying component of an air suspension system used on machines, automobiles, truck ,trailer and buses. Guangzhou Viking Auto Parts Co., Ltd. is a professional manufacturer in designing and producing air springs .We have obtained IATF 16949:2016 and ISO 9001:2015 certification. Our products are greatly appreciated in OEM and after market.