Unity 31-513400 Air Spring to Coil Spring Conversion Kit - Rear

Rear Air Spring Conversion for Mercedes-Benz

Restore the rear suspension on select Mercedes-Benz S-Class models with this pre-assembled complete strut assembly conversion kit from Unity. Part number 31-513400 is built for rear applications and is intended for vehicles originally equipped with air or electronic strut assemblies.

Key Features

• Rear position air spring to coil spring conversion kit
• Pre-assembled complete strut assembly conversion design
• Built to OEM specifications for proper suspension fitment
• Made by Unity Automotive, a suspension-focused aftermarket manufacturer with over 40 years of experience
• Cross-references Arnott Industries C-2242 for the same application
• Part number 31-513400 for easy identification

Fitment Details

• Fits 2006 Mercedes-Benz S350, rear; excludes 4Matic; replaces air/electronic strut assemblies.
• Fits 2000-2006 Mercedes-Benz S430, rear; excludes 4Matic; replaces air/electronic strut assemblies.
• Fits 2000-2006 Mercedes-Benz S500, rear; excludes 4Matic; replaces air/electronic strut assemblies.
• Fits 2001-2006 Mercedes-Benz S600, rear; excludes 4Matic; replaces air/electronic strut assemblies.

What This Part Helps Address

• Rear suspension sag from failing air struts
• Warning lights related to air or electronic suspension faults
• Uneven ride height at the rear of the vehicle
• Loss of ride control caused by worn suspension components
• Need for a coil spring conversion on air-suspension-equipped S-Class models

Installation Notes

Verify rear fitment and confirm the vehicle is not equipped with 4Matic before ordering. This kit is intended for models that originally used air or electronic rear strut assemblies, and the pre-assembled design helps streamline replacement on the vehicle. Confirm the application against part number 31-513400 and the vehicle’s suspension configuration before installation.

Quality Assurance

Unity Automotive has more than 40 years of aftermarket suspension manufacturing experience and produces parts to OEM specifications. The brand focuses on suspension components built for consistent fit and dependable service in daily driving conditions.