Dorman 528-166 Suspension Control Arm - Rear Right Lower

Dorman 528-166 Rear Right Lower Control Arm

Dorman 528-166 is a standard replacement suspension control arm built for specific rear suspension applications on Cadillac XTS, Buick Regal, and Buick LaCrosse models. It is precision-engineered and tested to replace the original equipment control arm on the listed vehicles.

Key Features

• Rear right lower suspension control arm for select Cadillac and Buick applications
• Steel construction with a powder-coated finish
• Rubber bushings included; ball joint not included
• Non-adjustable, boxed control arm design
• No grease fitting and no mounting hardware included
• Black bushing and control arm finish for OE-style service replacement

Fitment Details

• Fits 2013-2019 Cadillac XTS, rear right lower.
• Fits 2014-2017 Buick Regal, rear right lower.
• Fits 2013-2016 Buick LaCrosse, rear right lower.
• Fits 2013-2016 Buick LaCrosse, rear right lower, w/RPO Code GNE (H-Arm Rear Suspension).

Detailed Description

This Dorman suspension control arm is built as a direct replacement for the rear right lower position on the listed Cadillac XTS, Buick Regal, and Buick LaCrosse vehicles. The steel arm uses a boxed design with a powder-coated finish for corrosion resistance, and it includes rubber bushings to match the original suspension layout. Part number 528-166 is a practical choice when restoring rear suspension geometry and replacing a worn OE arm on these specific applications. This part cross-references Monroe Shocks & Struts (e.g., RK642391) for the same application.

What It Helps Address

• Rear suspension clunking from worn control arm bushings
• Excessive rear wheel movement caused by a fatigued control arm
• Uneven tire wear related to rear suspension looseness
• Handling instability from worn rear suspension components
• Noise and vibration from deteriorated OE-style suspension links

Installation Notes

Verify rear right lower fitment before installation, especially on 2013-2016 Buick LaCrosse models with RPO Code GNE (H-Arm Rear Suspension). Inspect adjacent bushings and suspension hardware for wear before replacing the arm. Because mounting hardware is not included, reuse or source the correct hardware as needed for the vehicle.

Quality Assurance

Dorman manufactures this control arm as a standard replacement part and subjects it to engineering and testing checks to support reliable OE-style service on the listed vehicles.