Dorman 520-175 Suspension Control Arm - Rear Left Upper Forward

Dorman 520-175 Rear Left Upper Forward Control Arm

This Dorman suspension control arm is a direct replacement for the rear left upper forward position on select BMW models. Built from stamped steel with a coated black finish, it is engineered to restore proper suspension geometry and dependable rear-end control.

• Precision-engineered replacement for the original equipment control arm
• Stamped steel construction for strength and consistent fit
• Coated black finish for added corrosion resistance
• Rubber bushing included with black bushing color
• Welded ball joint mounting type with threaded stud type
• No ball joint installed and no grease fitting included
• Compatible with rear left upper forward suspension locations on select BMW 220i, 230i, 330i, 428i, and 435i applications

Detailed Product Overview

Dorman 520-175 is a suspension control arm designed for BMW rear suspension service where the original arm has worn bushings, developed play, or mounting fatigue. Its stamped steel body, 262.5 mm overall length, and rubber bushing construction support stable alignment and predictable suspension movement. This part cross-references MOOG Chassis Products RK643543 for the same application.

Fits 2014-2021 BMW 220i, rear left upper forward. Fits 2017-2021 BMW 230i, rear left upper forward. Fits 2016-2018 BMW 330i, rear left upper forward. Fits 2014-2016 BMW 428i, rear left upper forward. Fits 2014-2016 BMW 435i, rear left upper forward. The fitment also covers additional BMW 1 Series, 3 Series, 4 Series, and M Performance applications listed for the same rear left upper forward position.

What This Control Arm Helps Address

• Rear suspension looseness or clunking from worn control arm bushings
• Uneven tire wear caused by suspension geometry changes
• Rear-end instability during braking or cornering
• Excessive movement at the rear left upper forward suspension point
• Noise and vibration from deteriorated OE-style suspension components

Installation Notes and Tips

Verify the rear left upper forward position before installation and compare the original arm length, bushing layout, and mounting style to the replacement part. Mounting hardware is not included, and the ball joint is not preinstalled. Because this component is not adjustable, final alignment should be checked after installation on BMW 220i, 330i, 428i, and related models.

Quality Assurance

Dorman states that this control arm is precision-engineered and rigorously tested to provide a reliable OE-style replacement for specific vehicles. The coated steel construction and tested replacement design support consistent service life in rear suspension repair.