Dorman 521-489 Suspension Control Arm - Rear Left Upper Rearward

Dorman 521-489 Rear Left Upper Control Arm

Dorman 521-489 is a suspension control arm for specific Mercedes-Benz rear suspension applications, including CL550, CL500, S350, S400, S550, S450, S500, CL63 AMG, and S63 AMG models. It is precision-engineered and tested as a direct replacement for the original equipment control arm on the rear left upper rearward position.

Key Features

• Aluminum construction with a coated black finish
• Casting/forged design for OE-style replacement fit
• Includes bushings with rubber bushing material
• Ball joint mounting type: welded
• Ball joint stud type: threaded
• No ball joint installed and no grease fitting included
• Overall length: 262.5 mm
• End 2 type: press in

Detailed Description

This Dorman suspension control arm, part number 521-489, is built for the rear left upper rearward location on select Mercedes-Benz vehicles. It is used from frame to knuckle and is designed as a replacement for the original suspension arm on 2007-2014 Mercedes-Benz CL550, 2007-2013 CL500, 2012-2013 S350, 2010-2013 S400, 2007-2013 S550, 2008-2011 S450, 2007-2011 S500, 2008-2010 CL63 AMG, and 2008-2010 S63 AMG. This part cross-references Delphi TC2478 for the same application.

The arm uses aluminum construction with a black coated finish and rubber bushings already included. Its welded ball joint mounting design and threaded stud type support OE-style suspension geometry, while the press-in end and bushing-style linkage end match the original mounting layout. Dorman 521-489 is a practical choice when replacing a worn rear control arm on Mercedes-Benz CL-Class and S-Class models.

What It Helps Fix

• Rear suspension clunking or knocking from worn bushings
• Excessive rear wheel movement caused by a fatigued control arm
• Uneven tire wear related to rear suspension looseness
• Rear alignment instability after suspension wear
• Handling noise or vibration from a deteriorated rear left upper rearward arm

Installation Notes and Tips

Install this control arm in the rear left upper rearward position only. Confirm vehicle year, model, and suspension layout before replacement, and compare the original arm length and mounting style to the new part. Because mounting hardware is not included, reuse or source the correct hardware as needed during service. A professional alignment is recommended after suspension work on Mercedes-Benz CL550, S550, and related applications.

Quality Assurance

Dorman manufactures this control arm as a precision-engineered replacement and subjects it to testing for reliable OE-style service on the listed applications. Part number 521-489 is built to match the original suspension function for the specified Mercedes-Benz fitments.