Bilstein 40-303437 Air Suspension Spring - Rear Right

Bilstein B3 OE Replacement Air Spring

The Bilstein B3 OE Replacement (Air) air suspension spring restores the rear right corner of select Mercedes-Benz models with an OE-style fit and direct connector connection. Built for the 2011-2017 Mercedes-Benz E350, E400, CLS400, and CLS550 applications listed below, part number 40-303437 is made to return the original ride height and air suspension function.

Bilstein’s B3 OE Replacement (Air) line focuses on direct replacement air bags for European vehicles, using OE supplier engineering to match factory standards and preserve the original driving feel. This rear right air suspension spring is finished in black paint and is designed for modification-free installation on the specified Mercedes-Benz applications.

Key Features

• OE replacement air suspension spring for the rear right position
• Direct-connect design for factory-style installation
• Black paint finish
• Bilstein B3 OE Replacement (Air) series
• Part number 40-303437 for easy identification
• Built for select Mercedes-Benz air suspension applications

Detailed Description

Bilstein 40-303437 is an air suspension spring engineered for Mercedes-Benz rear right applications that use factory air suspension. It is listed for 2015-2017 Mercedes-Benz CLS550 rear right, 2015-2016 Mercedes-Benz CLS400 rear right, 2011-2016 Mercedes-Benz E350 rear right with air suspension, 2015-2016 Mercedes-Benz E400 rear right with air suspension, and 2012-2014 Mercedes-Benz CLS550 rear right with air suspension. If you are searching for a rear right air suspension spring for Mercedes-Benz CLS550, Mercedes-Benz CLS400, or Mercedes-Benz E350/E400 with air suspension, this OE replacement part number 40-303437 matches the listed applications.

This part cross-references Mercedes-Benz 212 320 20 25 and 212 320 40 25 for the same application.

What It Helps Address

• Rear corner sagging from a worn air spring
• Uneven ride height at the rear right of the vehicle
• Air suspension leaks that affect normal stance
• Loss of factory ride quality on air-suspension-equipped Mercedes-Benz models
• Warning lights or suspension faults related to air spring failure

Installation Notes and Quality

Install only on the exact listed vehicle, year, model, and rear right position. Confirm air suspension equipment before ordering, especially on Mercedes-Benz E350 and E400 applications. The direct connector design supports factory-style replacement without modification when used on the correct application.

Bilstein supplies OE-level suspension components, and the B3 OE Replacement (Air) line is built to meet the standards expected for original-equipment replacement on select European vehicles.