With double adjustable, single adjustable, drag ''R'' series adjustable and non-adjustable valving options, you will find the right shock for you. Designed for the Mustang II suspension, QA1 Stocker Stars are made of high quality aluminum for great looks and durability. All QA1 aluminum shocks are 100% dyno tested and serialized before leaving our Minnesota factory, ensuring your shocks are of the highest quality. Made in the USA, these shocks offer easy, bolt-in installation with no cutting or welding required. They are 100% dyno tested and serialized and serviceable and rebuildable by QA1 authorized service centers.