As D2B said, the accumulators are usually what fails. They can be purchsed from our host for $114 (US) each.

If you change out the rear to a more coventional setup. the shocks are going to run you about $100 each and the springs less than $100.

If you choose that route, get the sportline springs for a 190e and get the Sport Bilsteins to match the front Sports. Ride is not too bad.

From what I have read, when the SLS is working correctly, it is a good compromise between ride and handling.

Tinker