Front Left Lower Control Arm w Ball Joint & Bushing - Cast Iron Fit

In this review the Metrix Premium Front Left Lower Control Arm is assessed for owners of older BMW models who need a durable, direct-replacement suspension component. Our review finds the part best for DIY mechanics and independent shops because it is supplied pre-greased, built from cast iron, and specified to match OE fitment across a wide range of 1992 to 2002 BMW models. The single biggest reason to consider this control arm is its stated adherence to higher manufacturing standards, with IATF 16949 and ISO 9001 certifications that suggest reliability over a plain aftermarket alternative.

Key Features

• Wide model compatibility: Covers many BMW sedans, coupes, convertibles and Z3 models from 1992 through 2002, reducing the chance of fitment surprises for older chassis.
• Pre-greased assembly: Shipped pre-greased to save installation time and help ensure smooth initial movement and reduced break-in wear.
• Cast iron construction: Offers a robust, heavy-duty material choice that resists bending under normal road loads for the chassis types listed.
• OE interchange numbers included: Matches known OE references such as RK80531 and 31121094275, which aids cross-referencing with factory or service manuals.
• Quality certifications: Manufactured under IATF 16949 and ISO 9001 processes so purchasers can expect consistent build standards versus unverified parts.
• Warranty backing: Comes with a 3 year / 36,000 mile limited warranty from installation for added peace of mind on wear-related issues.

Who It's For

This control arm is aimed at owners of older BMW models listed in the compatibility notes who want a long-lasting, direct-replacement suspension arm with a pre-greased ball joint and bushing. It suits DIY enthusiasts comfortable with front suspension work and independent garages performing routine chassis refreshes.

Those who should look elsewhere include owners of modern BMWs outside the listed years or drivers seeking lighter-weight aftermarket performance arms; the cast iron construction favors durability over weight savings or track-focused geometry changes.

Pros & Cons

Pros

• Good fitment across many BMW models, minimizing the need to hunt for an exact match.
• Pre-greased ball joint and bushing reduce installation prep time and initial wear.
• Manufactured to IATF 16949 and ISO 9001 standards, indicating consistent quality control.
• Three year / 36,000 mile limited warranty provides coverage after installation.

Cons

• Cast iron construction increases weight compared with some aftermarket aluminum options, which may be a concern for performance-focused builds.
• Not intended for vehicles outside the listed fitment, so verification before purchase is required.

Specifications

Brand	METRIX PREMIUM CHASSIS PARTS
Material	Cast Iron
Quantity in box	1
OE / Interchange	RK80531, CMK80531, 520-739, 31121094275
Compatibility highlights	BMW 318i/318is/318ti, 320i, 323i/323is/323iC, 325i, 328i/328is/328iC, Z3 (1992-2002)
Certifications	IATF 16949, ISO 9001
Warranty	3 Year / 36,000 miles Limited Warranty

Our Verdict

The Metrix Premium front left lower control arm is a practical, value-oriented replacement for owners of compatible BMWs who need a reliable OE-style part that arrives pre-greased and backed by quality certifications. It is a sensible buy for routine chassis repairs and restoration work where durability and correct fit matter more than weight savings or performance tuning adjustments.

Frequently Asked Questions

Will this fit my 1999 BMW 328i convertible?
Yes, the control arm lists compatibility with the 1999 BMW 328i convertible as one of the covered models.

Is the ball joint pre-greased?
Yes, the assembly is supplied pre-greased to aid installation and reduce initial wear.

What warranty does this part include?
Metrix provides a 3 year / 36,000 mile limited warranty from the date of installation.