Unity automotive has over 50 years of experience manufacturing parts in the aftermarket automotive industry. The company offers superior quality, specializing in making rock solid auto parts that withstand the test of time. With a true understanding of their marketplace they have become the industry leader in innovation of aftermarket suspension. Unity automotive delivers top of the line quality suspension parts made to insure a trouble-free installation and long-lasting reliability. The Elite Suspension Line Powered by Unity offers both OE Remanufactured and Brand-New Replacement (Electronic and Non-Electronic) Air Strut Assembly Bundles. Our Air Struts are built to Original Equipment specifications being a perfect replacement for the faulty air strut assemblies in your vehicle. The kit includes 2 electronic air suspension strut assemblies that will help you regain that smooth comfortable ride, while providing structural support for your vehicle and its load.2012-2013 Mercedes-Benz S350, 2010-2013 Mercedes-Benz S400, 2007-2011 Mercedes-Benz S500, 2007-2013 Mercedes-Benz S550, 2007-2013 Mercedes-Benz S600 NOTE: Excludes 4Matic Models