GL450 Front Suspension Part Numbers: Complete Guide

Finding the correct part number for your Mercedes-Benz GL450 front suspension can be frustrating. A single mistake—like ordering a part for the wrong suspension type or model year—can mean returns, delays, and lost money. This guide walks you through the most common front suspension components, explains how to decode the part numbers, and offers practical tips to ensure you get the right parts the first time.

The GL450 (X164 generation, 2007–2012) came with two distinct front suspension systems: the standard steel-spring setup and the optional Airmatic air suspension. Many parts are not interchangeable between them, so your first step is always to confirm which system your vehicle has. You can check the build sheet, look under the hood for an air reservoir and compressor, or inspect the front struts—air struts have a large rubber bellows, while steel struts have a coil spring.

Understanding GL450 Front Suspension Part Numbers

Mercedes-Benz part numbers follow a structured format that reveals a lot about the component. Typically, they start with a three-digit prefix (e.g., 164, 211, 220) that indicates the vehicle series. For the GL450, the prefix is usually 164. The next three digits identify the sub-group, followed by a two-digit suffix. For example, a front control arm might be 164 330 02 11. Here is a breakdown:

• 164 = X164 chassis (GL-Class)
• 330 = Suspension arms/tie rods group
• 02 = Version or design variant (often updated)
• 11 = Specific part variant (left or right, with or without bushings)

Knowing this format helps you verify whether a part number matches your vehicle’s requirements. Always cross-check the full number against Mercedes’ official parts catalog or a trusted OEM database.

Where to Find the Part Number on Your Vehicle

Many suspension components have the part number stamped or labeled directly on them. For struts, look on the metal cylinder near the bottom. Control arms often have the number on the cast metal or on a sticker. If the part is too worn or dirty, you can clean it and use a flashlight. Alternatively, you can get the part number from the dealer by providing your VIN.

Common GL450 Front Suspension Parts and Their Numbers

Below are the most frequently replaced front suspension components for the GL450. Note that part numbers can vary by model year, suspension type, and whether the car has 4MATIC (all GL450s do). Always verify with your VIN.

Front Strut Assembly (Airmatic)

If your GL450 has air suspension, the front strut is a major component. It includes the air spring and the shock absorber. The left and right parts are different, so never assume they are interchangeable.

• Left (driver side): 164 320 03 13 (early models) or 164 320 04 13 (later models, updated damping)
• Right (passenger side): 164 320 03 14 or 164 320 04 14

These numbers are for the complete strut assembly. You may also need the air supply line and electrical connector separately.

Front Shock Absorber (Steel Suspension)

For steel-spring GL450s, the front shocks are separate from the spring. Replacement shocks are standard hydraulic units.

• Left: 164 320 00 31
• Right: 164 320 00 32

Note that these shocks are specific to the non-air suspension. Do not use them on an Airmatic car.

Front Lower Control Arm (Frontward Arm)

The lower control arm is a common wear item. It connects the steering knuckle to the subframe. There are two lower arms per side—a front arm and a rear arm. The front arm (also called the tension strut) often fails first.

• Left front arm: 164 330 02 11
• Right front arm: 164 330 02 12

These arms come with the ball joint and bushing pre-installed. Some aftermarket versions may not include the bushing; if you buy without, you’ll need to press it in.

Front Lower Control Arm (Rearward Arm)

This is the part that connects the lower ball joint to the chassis. It is smaller than the front arm.

• Left rear arm: 164 330 01 11
• Right rear arm: 164 330 01 12

Front Upper Control Arm

The upper control arm sits above the wheel and connects the knuckle to the frame. Failure often causes clunking noises and uneven tire wear.

• Left: 164 330 04 11
• Right: 164 330 04 12

Front Stabilizer Link (Sway Bar Link)

Stabilizer links attach the sway bar to the strut. They are cheap and easy to replace.

• Left: 164 320 00 89
• Right: 164 320 00 90

For the GL450, front stabilizer links are the same for both air and steel suspension.

Front Tie Rod Assembly

Tie rods control steering. The outer tie rod end is the most frequently replaced part.

• Left: 164 460 04 05
• Right: 164 460 04 06

How to Verify Your Part Number

Even if you have a part number, it’s critical to verify it fits your specific vehicle. Here’s a reliable process:

1. Locate your VIN (on the windshield, driver’s door jamb, or owner’s manual).
2. Call a Mercedes dealer parts counter and ask them to confirm the correct part number for your VIN and suspension type. They can access the official parts database.
3. Check online OEM parts catalogs from reputable retailers (not marketplaces). Input your VIN and cross-reference the part numbers listed.
4. Compare the part number construction: Look at the prefix and the sub-group. If it starts with 164, it’s likely correct for a GL450, but some parts are shared with other models (like the ML350), so confirm the suffix matches your car’s configuration.

Common Mistakes to Avoid

• Buying left and right parts that are identical when they should be mirror images (e.g., struts, control arms).
• Assuming a part from a 2008 GL450 fits a 2011 GL450. While many are the same, running changes do occur.
• Ordering Airmatic struts for a steel-suspension car, or vice versa. The cost difference is significant.
• Using aftermarket parts that don’t include required sensors or valves (especially for air suspension).

OEM vs. Aftermarket Part Numbers

This article focuses on OEM (Original Equipment Mercedes) part numbers. Aftermarket brands like Moog, TRW, or Lemförder often have their own numbers, but they may cross-reference to OEM numbers. When you search for a part, always confirm the OEM number first, then look for aftermarket versions that explicitly list that OEM number in their fitment. Keep in mind that critical components like air struts should ideally be OEM or a high-quality brand like Arnott, as cheap alternatives can fail quickly and damage the air suspension system.

Final Recommendation

Before ordering any GL450 front suspension part, always start by determining your suspension type (Airmatic or steel spring) and obtaining your VIN. Write down the OEM part numbers for the specific components you need—using the listings above as a starting point. Then verify each number with a dealer or a trusted online catalog that uses your VIN. This extra step is worth the time because suspension parts are often non-returnable once installed, and the wrong part can leave your vehicle undriveable. For air suspension systems, pay special attention to the part numbers for the struts and air lines, as they are not universal. By following this method, you can confidently order the correct parts and avoid costly mistakes.