Suspensia X31CJ0643 Suspension Control Arm and Ball Joint Assembly - Front Left Upper

Mercedes-Benz Front Left Upper Control Arm Assembly

Suspensia X31CJ0643 is a front left upper suspension control arm and ball joint assembly built for select Mercedes-Benz applications. It combines an aluminum control arm, pre-greased construction, and a corrosion-resistant finish to support precise front suspension movement and long-term serviceability.

Compatible with Mercedes-Benz E350, CLS550, E250, and E550 front left upper positions, this assembly is a direct-fit replacement for common OE-style suspension service. Part number X31CJ0643 is manufactured in Turkey in IATF16949 certified factories under ISC Industries.

Key Features

• Aluminum control arm with corrosion-resistant finish
• Pre-greased assembly for ready-to-install service
• Ball joint mounting type: press-in
• Ball joint stud type: threaded
• Bushing included with composite bearing type
• Mounting hardware included
• Non-adjustable design
• Grease fitting not included; greaseable design not provided

Detailed Description

This Suspensia control arm and ball joint assembly is engineered for front suspension repair where OE-style geometry and stable steering response matter. The aluminum arm helps maintain strength while keeping weight down, and the corrosion-resistant finish supports durability in demanding road conditions. The pre-greased design and included bushing simplify replacement of worn suspension components on Mercedes-Benz E350, CLS550, E250, and E550 models.

Part number X31CJ0643 cross-references Genuine 2123303211 and Mevotech Supreme CMS101389 for the same application.

What It Helps Fix

• Front-end clunking or knocking from worn ball joint or bushing wear
• Loose or imprecise steering feel at the front left upper suspension point
• Uneven tire wear caused by suspension play
• Excess movement in the upper control arm assembly
• Restoration of proper front suspension alignment after component wear

Installation Notes and Tips

Fits 2010-2016 Mercedes-Benz E350, Front Left Upper; 2012-2014 Mercedes-Benz CLS550, Front Left Upper; 2014 Mercedes-Benz E250, Front Left Upper; and 2010-2014 Mercedes-Benz E550, Front Left Upper. Verify suspension orientation and part match before installation, and inspect adjacent bushings, fasteners, and alignment settings during service. Because this assembly uses a press-in ball joint and threaded stud type, proper suspension tools and a post-install alignment are recommended.

Quality Assurance

Suspensia is owned by ISC Industries, a Turkish suspension manufacturer that supplies OE Tier 1 customers including Ford, Fiat/Chrysler, Volkswagen Group, and Renault/Nissan, along with Tier 2 suppliers worldwide. X31CJ0643 is manufactured in Turkey in IATF16949 certified factories for controlled production quality.