ApplicationThese air suspension bags are aftermarket ones. They will replace the original rear air springs.SpecificationSingle Port Size:  1/2-14NPT 2 smaller bolt holes diameter:  0.31\" /8mm 1 bigger bolt hole diameter:  0.7\"/18mm Air spring bag Extended diameter:  5.31\"/170mm Air spring bag min height:  2.25\"/75mm Air spring bag capacity:  2500LBS Placement on Vehicle: rear , front, right ,Left Quantity: 2 pieces Condition: Brand New Engineered for superior durability, backed by industry leading warranty Brand new unit, not a used, rebuilt, or junkyard part! Direct fit replacement with no modifications needed Part comes with a full 24 month unlimited mileage warranty.NoteProfessional installation is highly recommended (No Instruction Included) For any needs please contact us.