From my archived notes (probably from that old thread). You may want to verify the information:
Belt:
For the belt delete on a 94 E320, replace belt 6PK2145 to belt 6PK2415.
Mercedes Benz Part Number: 011-994-47-92
Generic Part Number: 6PK2415
Available for $20.53 from ********AZ
Smog Pump Bearing:
For the 94 E320,
http://bearingsdirect.com/products/index.php?action=category&id=56&subid=100 Easy fix for $30 or so per bearing.
"The smog pump clutch bearings are available in California. Our neighbor Steven sells the bearings. His company name is:
The Expediter, Engineering Design, Phone (310) 833-6388"
The dimensions are 32mm ID, 52 mm OD, height is 18mm.