Here is a brand NEW NOS Genuine Mercedes-Benz heat exchanger hose.
MB Part# 1408301696 
Pay a little more and get a genuine hose.
It has been stored in the bag since new and was never used or even opened.
It should fit the following W140 Models:
1994-1998  S500 S420 S320  
It might fit the years and models listed in the title but I can not guarantee it so please compare part #s and research it for yourself before buying.  
It is the buyers responsibility to check interchange years and match part #'s before buying.

This is part of a large lot of parts that was acquired from a garage.

Sold as is.  No returns unless the part is not as described and pictured.