Moog RK621120 Suspension Control Arm and Ball Joint Assembly - Rear Right Upper Forward

BMW X5/X6 Rear Right Upper Forward Control Arm

Restore rear suspension geometry with the Moog RK621120 suspension control arm and ball joint assembly. This forged aluminum replacement is built for the rear right upper forward position on select BMW X5 and BMW X6 models, with pre-greased components and included bushings for a service-ready fit.

Compatible with 2007-2018 BMW X5, rear right upper forward, and 2008-2019 BMW X6, rear right upper forward. The RK621120 is engineered to meet OEM standards for the application while adding structural strength and corrosion protection.

• Forged aluminum control arm construction
• Pre-greased for initial service readiness
• Press-in ball joint with threaded stud type
• Rubber bushings included
• Mounting hardware included
• Gray finish for corrosion resistance
• Non-adjustable design for direct replacement fitment

Detailed Product Overview

The Moog RK621120 is a suspension control arm and ball joint assembly for the rear right upper forward position on BMW X5 and BMW X6 applications. Its forged aluminum construction supports structural rigidity while the rubber bushings help isolate suspension movement. This part cross-references Dorman OE Solutions 521-586 for the same application. Use RK621120 when replacing a worn rear suspension arm on BMW X5 or BMW X6 vehicles and you need a direct-fit OE-style replacement.

Common Problems This Part Addresses

• Rear suspension clunking or knocking from a worn ball joint
• Excessive play in the rear right upper forward control arm
• Uneven rear tire wear caused by suspension geometry issues
• Loose or unstable rear-end handling over bumps
• Corrosion-related failure of the original control arm assembly

Installation Notes and Tips

Verify the rear right upper forward position before ordering, since this assembly is position-specific. Inspect adjacent bushings, fasteners, and alignment components during replacement, and perform a wheel alignment after installation. The press-in ball joint design and included mounting hardware support a straightforward service replacement on compatible BMW X5 and BMW X6 models.

Quality Assurance

Moog premium control arms are engineered for structural strength and corrosion protection on foreign and domestic nameplates. The RK621120 is built to meet OEM standards for the listed BMW applications and is backed by Moog’s product quality standards.