Bilstein 44-273439 Air Suspension Strut - Front Left

Bilstein B4 OE Replacement (Air) Front Left Strut

The Bilstein B4 OE Replacement (Air) front left air suspension strut restores factory-style ride control for select Mercedes-Benz GLS and GL models with electronic suspension. Part number 44-273439 is built for direct connection to the original vehicle connectors, supporting a modification-free replacement on the front left corner.

Key Features

• Bilstein B4 OE Replacement (Air) series for air suspension applications
• Monotube internal design for consistent damping response
• Black painted finish
• Front left position
• Lower mount type: clevis
• Upper mount type: special
• Boot not included
• Direct-fit replacement for original air suspension connections

Product Line Details

The Bilstein B4 OE Replacement (Air) line is focused on replacing original air suspension dampers on many European vehicles. Bilstein supplies OE air suspension systems, and this product line follows the same fitment and connector approach used by the factory setup. For buyers searching for a Mercedes-Benz GLS450 front left air suspension strut or a Mercedes-Benz GL550 OE replacement air strut, 44-273439 provides a factory-style service part solution.

Fitment

• Fits 2017-2019 Mercedes-Benz GLS450, front left, with electronic suspension; B4 OE Replacement (Air)
• Fits 2017-2019 Mercedes-Benz GLS550, front left, with electronic suspension; B4 OE Replacement (Air)
• Fits 2017 Mercedes-Benz GLS350d, front left, with electronic suspension; B4 OE Replacement (Air)
• Fits 2013-2016 Mercedes-Benz GL350, front left, with electronic suspension; B4 OE Replacement (Air)
• Fits 2015-2016 Mercedes-Benz GL450, front left, with electronic suspension; B4 OE Replacement (Air)
• Fits 2013-2016 Mercedes-Benz GL550, front left, with electronic suspension; B4 OE Replacement (Air)

What It Helps Address

• Front left air strut leakage or loss of damping control
• Uneven ride height on the affected corner
• Excessive bounce, harshness, or reduced ride stability
• Warning lights or suspension performance issues tied to the original air strut
• Factory ride feel that has changed as the original unit wears

Installation Notes

Install on the front left position only and verify electronic suspension equipment before ordering. This part number 44-273439 connects directly to the original vehicle connectors and uses a clevis lower mount with a special upper mount. Confirm the vehicle’s suspension configuration against the listed Mercedes-Benz GLS450, GLS550, GLS350d, GL350, GL450, or GL550 fitment before replacement.

Quality Assurance

Bilstein is an OE supplier for air suspension systems, and the B4 OE Replacement (Air) line is engineered to meet the standards expected for original-equipment replacement on European vehicles. Part number 44-273439 is built to restore the original feel of the vehicle while maintaining OE-style fit and function.