The Bilstein B12 (Pro-Kit) is the result of two companies atop their industries collaborating to present the ultimate solution in suspension for the passenger car market. The shock absorber experts at Bilstein and the spring professionals at Eibach used their 120 years of combined experience and knowledge to spawn Performance2. The B12 system consists of four high performance Bilstein dampers, four hi-tech industrial Eibach lowering springs and together you have the best handling, most comfortable direct fit suspension system available today. Complete Suspension Kit Mercedes-Benz C250 2014-2010; C300 2011-2008; C350 2014-2008; E350 2014-2010; E550 2014-2010 Mercedes-Benz C250 2014-2012, C300 2011-2008, C350 2014-2008, E350 2014-2010, E400 2016-2015, E550 2017-2010