Brand New Race-Driven High Quality Gas Shocks. You will receive 1 rear gas shock to fit the following models: 2009 2010 2011 2012 2013 2014 2015 Arctic Cat Alterra 550 XT/LTD/GT. Replace your stock OEM shocks for a smoother ride at a fraction of the price. Engineered and built with the exact dimensions of OEM to meet or exceed original quality standards and to give longer lasting performance. This is a huge upgrade for your suspension. Race-Driven is an industry leader in quality aftermarket parts. Race-Driven is committed to bringing the highest quality products to all riders at an affordable price. Customer Driven – Quality Driven – Race-Driven.