Dorman 526-578 Lateral Arm - Rear Right Upper Rearward

OE-Style Rear Right Upper Rearward Lateral Arm

Dorman 526-578 is a steel lateral arm built as a standard replacement for the rear right upper rearward suspension position. It is precision-engineered and tested for specific Audi applications, including Audi A4, A5, S4, S5, and RS5 models.

For Audi A4 rear suspension repair, Audi A5 rear control arm replacement, or an Audi S5 rear right upper rearward lateral arm, this part is built to match the original layout and mounting style. The Dorman 526-578 uses rubber bushings and a bent steel design for OE-style fitment.

Key Features

• Steel construction for suspension service replacement
• Standard replacement lateral arm for the rear right upper rearward position
• Rubber bushings included
• Bushing color: black
• Bent shape with bushing-to-bushing attachment points
• No ball joint included
• No mounting hardware included
• Non-adjustable and non-greaseable design

Detailed Description

This Dorman lateral arm is designed for rear suspension applications where the original arm has worn bushings, looseness, or alignment-related movement at the rear right upper rearward location. The steel body and rubber bushings are selected for direct replacement use on compatible Audi chassis, helping restore the suspension geometry used by the factory setup. This part cross-references Audi OE numbers 8W0505398C and 8W0505398E for the same application.

Compatible With 2017-2025 Audi A4, Rear Right Upper Rearward; 2017-2025 Audi A4 allroad, Rear Right Upper Rearward; 2017-2025 Audi A4 Quattro, Rear Right Upper Rearward; 2018-2025 Audi A5 Quattro, Rear Right Upper Rearward; 2018-2025 Audi A5 Sportback, Rear Right Upper Rearward; 2017-2025 Audi S4, Rear Right Upper Rearward; 2018-2025 Audi S5, Rear Right Upper Rearward; and 2018-2025 Audi S5 Sportback, Rear Right Upper Rearward. It also fits 2018-2019 Audi A5 and RS5, plus 2021-2025 Audi A5, RS5, and RS5 Sportback in the same rear right upper rearward position.

What It Helps Address

• Rear suspension clunking from worn lateral arm bushings
• Excessive play at the rear right upper rearward suspension point
• Uneven rear suspension response caused by a damaged arm
• Restoration of factory-style rear suspension geometry after wear
• Replacement for bent or fatigued OE lateral arm components

Installation Notes and Tips

Verify the rear right upper rearward position before installation and compare the arm length, bushing style, and mounting hole dimensions to the removed part. Because mounting hardware is not included, reuse or source the correct fasteners as needed. After installation, a professional wheel alignment is recommended whenever rear suspension components are replaced.

Quality Assurance

Dorman designs this replacement lateral arm for specific vehicle applications and subjects it to testing for fit and function. The part is built as a standard replacement for OE-style service on Audi rear suspension systems.