Check out this thread:

http://www.peachparts.com/shopforum/showthread.php?t=132549&highlight=w124+differential+mounts

The job doesn't sound super challenging, but without the right tools it can be difficult and require many 4 letter words

Good luck!

__________________
Daily Driver: 02 E430 4MATIC
In the family: '03 E500 // '04 ML500 // 64 220SE