Front Lower Forward Control Arm for 2015-2017 Mercedes CLS400 AWD

In this review of the Metrix front lower forward control arm assembly, the bottom line is simple: this is a targeted replacement part for Mercedes-Benz owners who need a direct-fit, durable control arm with a pre-greased ball joint and bushing. Our review finds it best suited to technicians and DIYers replacing the front lower forward arm on compatible AWD and sedan models because it emphasizes fitment, long-term durability, and a warranty-backed purchase. The single biggest reason to buy is the part's OE interchangeability and certification, which help ensure reliable steering geometry and suspension performance after installation.

Key Features

• Direct fit compatibility: Built to match OE/interchange numbers so installation is straightforward on listed Mercedes-Benz models without extensive modification.
• Pre-greased components: The ball joint and bushing arrive pre-lubricated to reduce initial wear and simplify assembly during replacement.
• Steel construction: The use of steel provides the strength required for suspension loads and long-term durability under normal driving conditions.
• Exceeds OEM standards: Manufactured to IATF 16949 and ISO 9001 quality processes to deliver consistent manufacturing and dimensional accuracy.
• Warranty backed: Includes a 3 year / 36,000 mile limited warranty from installation, offering support for early failures and peace of mind.

Who It's For

This control arm is for owners and mechanics working on 2010-2018 Mercedes-Benz models listed in the compatibility section who need a like-for-like replacement that meets or exceeds original equipment standards. It suits someone who values correct alignment geometry and prefers parts that arrive ready to install with pre-greased joints.

It is not for someone seeking a generic universal arm or for owners of non-listed vehicles; always verify OE/interchange part numbers RK622443, CMS101396, 524-512, or 2123301911 against your VIN before purchase. Drivers wanting a complete suspension overhaul should consider replacing complementary components rather than a single arm alone.

Pros & Cons

Pros

• Direct OE interchangeability improves fit and reduces installation time for compatible Mercedes models.
• Pre-greased ball joint and bushing help extend lifespan and simplify the initial service.
• Manufactured under IATF 16949 and ISO 9001 with a steel build for reliable structural performance.
• Backed by a 3 year / 36,000 mile limited warranty for added buyer confidence.

Cons

• Fitment is specific to listed Mercedes-Benz years and models, so it is not a universal replacement.
• Only one control arm is included in the box, so buyers replacing both sides will need to purchase two units.

Specifications

Brand	METRIX PREMIUM CHASSIS PARTS
Material	Steel
Quantity in box	1
OE / Interchange	RK622443, CMS101396, 524-512, 2123301911
Compatibility highlights	2015-2017 CLS400 AWD, 2015-2016 E350 AWD, 2015-2016 E400 Sedan, 2014-2016 E250 AWD, plus earlier Mercedes models
Certifications	IATF 16949 and ISO 9001
Warranty	3 Year / 36,000 miles Limited Warranty

Our Verdict

For Mercedes owners who need a reliable, like-for-like front lower forward control arm, this Metrix assembly is a practical choice thanks to OE interchange accuracy, pre-greased joints, and manufacturing certifications. It represents good value when replacing a failed arm because it reduces fitment risk and carries a meaningful warranty, though buyers should confirm vehicle compatibility and remember only one arm is supplied per box.

Frequently Asked Questions

Will this arm fit my Mercedes?
Check your vehicle year and model against the listed compatibility and confirm OE/interchange numbers RK622443, CMS101396, 524-512, or 2123301911 to ensure a direct fit.

Is the ball joint serviced or replaceable?
The ball joint and bushing arrive pre-greased for extended life; they are integrated into the assembly and intended as part of the replacement unit.

How many arms are included?
Each box contains one control arm, so replace both sides if needed by purchasing two units.