Fjærbein Mercedes W221 4MATIC Bilstein 44-109479

The BILSTEIN B4 air suspension module offers optimum safety and durability. 
Don't be satisfied with less than BILSTEIN if you need OE replacement.

In close cooperation with mercedes-Benz, this BILSTEIN B4 air suspension module was developed for maximum driving comfort. 
The revolutionary design provides damping, suspension and level control in one single part. 
The BILSTEIN B4 air suspension module is available for active and passive systems and is therefore the ideal OE replacement part for a perfect driving experience as on day one. 

Enclosed installation instructions of the manufacturer must be observed!

How to replace the strut you can see in this video. 
It is essential to act according to this installation video: https://youtu.be/S0kYIzo5aRs 
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Can be installed in the following vehicles:
Mercedes-Benz S-Class W221
Mercedes-Benz CL-Class C216/W216  >2006

Original spare part number:
A 221 320 55 13; 2213205513
A 221 320 55 13 89; 221320551389
A 221 320 21 13; 2213202113

OEM Bilstein:
44-109479 , VA5-A947

OEM Bilstein:
44-192075 , VA5-H536