MB Spares in Germany are offering a batch of E-Class Rear Axles (Some with Limited Slip Diff) For 95 - 99 Models and probably other years. Part Numbers are listed.

Ratios Listed
2.28
2.47
2.65
2.82
2.85
2.87
3.07
3.27
3.45
3.67

Priced at 818 Euro = 720 US Dollars (Plus Shipping)

Improve your gas mileage or Accelleration.

Site is at -
MB Rear Axle's

They also have loads more items for most models.
Look at -
Other ITEMS

Put in your Model (MB) and choose item from list.

Mike Stone