knocking noise
Was one of the springs actually broken?
If not, throwing parts at the car will probably not solve your problem.
Did you inspect the shocks, in particular the lower bushings when you had the springs removed?
There are many parts, springs among them, that can cause the knocking sounds you are hearing, such as bad shocks, worn bushings and broken suspension components.
If you're not capable of diagnosing the individual components, I'd get the car to a good mechanic or wheel alignment specialist (not necessarily at the MB dealer) and have them road test the car and get it up on a lift and see what's what.


