Hi spit64,
sometime down the model year, Mercedes changed the swaybar, I believe as a result of the different control arms. Also the breakes got larger, I believe!
If your arms are the type that have the replaceable ball joints, then the swaybar you got is the wrong one.
There are many types of bushings, regarding their composition. Some of them have small amounts of teflon coating, to make it easier to install. With rubber bushings, one has to be careful to apply grease, since it may damage them or wear faster.
Also, the mounting brackets need to be tightened all the way and torqued to, I believe 15'/lbs.
If they are not tight, they may cause the squeacky noise.

__________________
Mostly, I don't know notin, I just know where to look.
I am looking back, to over 30 years in Electronics Design.
Electrons don't care if they move in a car, computer or relay!

95 W124 E320 M104.992 - Because, I love to repair, naaaah!
Over 221,000 Miles
Cheers,
Norbert