Just as Jason said:
"I had to replace all front suspension bushings on my 1990 300TE.
Most of these bushings are relatively inexpensive. I suggest doing all of them. If you have a mixture of worn and non-worn parts, your new parts will just wear faster, and handling/ride will still be sub-par."

Don't forget engine mounts and shocks as well.

I did the whole job myself as a novice (with the exception of the bushings that had to be pressed out) and did a self allignment, limped it down to the tire shop for an alignment, and home in the same day.
The whole car rode much better.
Joel

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Joel P. Davis
1992 500SEL