Bilstein 44-291037 Air Suspension Strut - Front Left

Bilstein B4 OE Replacement Air Strut

Restore the original front suspension feel on select Mercedes-Benz GLS and GL models with the Bilstein B4 OE Replacement (Air) strut, part number 44-291037. This air suspension strut is built for direct connection to the factory system and is engineered for vehicles without electronic suspension.

• Bilstein B4 OE Replacement (Air) series
• Front left air suspension strut
• Monotube internal design
• Black paint finish
• Lower mount type: clevis
• Upper mount type: special
• Boot not included

OE-Style Replacement Design

The Bilstein B4 OE Replacement (Air) line is made for drivers who want a factory-style repair for air suspension wear. Bilstein supplies OE air suspension systems for many European vehicles, and this replacement damper is built to meet the original vehicle standards while connecting directly to the factory connectors. For Mercedes-Benz GLS450, GLS550, GLS350d, GL350, and GL450 applications, 44-291037 supports a clean, modification-free replacement on the front left corner.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Vehicle Fitment

• Fits 2017-2019 Mercedes-Benz GLS450, front left, without electronic suspension; B4 OE Replacement (Air)
• Fits 2017-2019 Mercedes-Benz GLS550, front left, without electronic suspension; B4 OE Replacement (Air)
• Fits 2017 Mercedes-Benz GLS350d, front left, without electronic suspension; B4 OE Replacement (Air)
• Fits 2013-2016 Mercedes-Benz GL350, front left, without electronic suspension; B4 OE Replacement (Air)
• Fits 2013-2016 Mercedes-Benz GL450, front left, without electronic suspension; B4 OE Replacement (Air)

Common Problems This Part Addresses

• Front left air strut leakage
• Uneven ride height at one corner
• Excessive bounce or reduced damping control
• Factory suspension warning symptoms related to worn air strut hardware
• Loss of original ride quality on Mercedes-Benz GLS and GL models

Installation Notes and Quality

Verify the vehicle is equipped without electronic suspension before ordering. Confirm the front left position and match the original connector style, lower clevis mount, and special upper mount before installation. Professional installation is recommended for air suspension service to ensure proper system function and ride-height calibration.

Bilstein B4 OE Replacement (Air) dampers are engineered as direct-fit OE replacement components for European applications, with construction and fitment focused on restoring factory ride characteristics.