I just wanted to thank Jere for the detailed procedure of replacing the spheres. I also have had the thumping sound from the right rear area of the car when I go over certain bumps or curbs. I took it to the dealer and they did not know what the cause was. They did show me that the right rear shock was leaking slightly but was not a major concern at that time. My ride does feel stiffer than two friends of mine who each have 96 S320 but I do not think that they have the automatic load leveling as in my 92 500 SEL. I await your findings.