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

BILSTEIN B4 air suspension module 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: 

Can be installed in the following vehicles: 
mercedes-BENZ GL X166 04.2012 - 12.2015

mercedes-BENZ GLS X166 11.2015 - 04.2019

Original spare part number: 
A 166 320 26 13, A 166 320 50 66, A 166 320 74 13, 1663202613, 1663205066, 1663207413

OEM bilstein:
44-291044