We've been through the usual yellow German shocks/struts. We've played the rebuild/revalve game so many times that we no longer even knew we were disappointed with the results. These are made by GAZ in England. The valveing is appropriate and works. They have adjustable rebound that makes them work with different setups/spring rates. With the Heavy Duty German stuff we were never able to get the rebuound control these have out of the box. Sold in pairs and are a direct replacement for a stock 240 strut insert. If you need specific modifications please contact us.