The Gas-a-just is available as an OE monotube replacement and as an OE twin-tube performance upgrade. The KYB Gas-a-just has two separate working chambers: An air-free hydraulic piston and valve area for responsiveness and control, and a second high-pressure nitrogen gas area with a floating piston that provides a comfortable ride during normal driving and adds instant performance on demand. High gas pressure design provides instant, extra control.Factory Sealed - Brand new in box. Misc Notes 1: KYB Shocks & Struts Gas-A-Just Rear JAGUAR Vanden Plas 1986-94 JAGUAR XJ6 XJ12 XJS Sovereign 1986-94. KYB Shocks & Struts Gas-A-Just Rear JAGUAR Vanden Plas 1986-94 JAGUAR XJ6 XJ12 XJS Sovereign 1986-94. The KYB Gas-a-just monotube shock absorber has additional performance advantages over the traditional twin-tube design: It can instantly, automatically adjust to your performance needs and never experiences fade due to aeration. The Gas-a-just high-pressure, monotube design delivers the control spirited drivers are looking for and its ideal for European cars. KarParts360 is a national company with warehouses in 4 different states: New Jersey, California, Georgia, and Illinois. We only sell BRAND NEW items. Feel free to reach out to us if you have any issues or concerns regarding your order. All carrier-related damage or loss claims must be made with the carrier within 48 hours of item receipt. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts & Accessories\Steering & Suspension\Shocks, Struts & Assemblies". The seller is "carlights360" and is located in this country: US. This item can be shipped to North, South, or Latin America, Japan.