Whiteline Sway Bar Mount Bushing - 18mm | Synthetic Elastomer, Grease Retaining (W21999-18)

Eliminate sway bar mount slop and restore precise handling with the Whiteline 18mm sway bar mount bushing. Designed to fit any 18mm diameter sway bar, this bushing features Whiteline's latest synthetic elastomer material with a knurled inner diameter specifically designed to retain grease — backed by Whiteline's Limited Lifetime Warranty.

Key Features:

• Fits 18mm diameter sway bars
• Whiteline synthetic elastomer construction
• Knurled inner diameter for grease retention
• Direct replacement for worn factory rubber bushings
• Improved handling precision and sway bar response
• Lightweight at 0.2 lbs
• Whiteline Limited Lifetime Warranty

Performance Benefits:

• Improved Handling: Eliminates sway bar mount movement for more precise roll control
• Grease Retention: Knurled ID holds grease for longer service life and reduced noise
• Longer Life: Synthetic elastomer outlasts factory rubber significantly
• Reduced Noise: Proper lubrication retention prevents dry bushing squeak
• Consistent Response: Firmer bushing material provides more direct sway bar engagement
• Lifetime Warranty: Backed by Whiteline's Limited Lifetime Warranty

Specifications:

• Brand: Whiteline
• Part Number: W21999-18
• Product: Sway Bar Mount Bushing
• Inner Diameter: 18mm
• Material: Synthetic elastomer
• Inner Surface: Knurled (grease retaining)
• Warranty: Whiteline Limited Lifetime Warranty
• Weight: 0.2 lbs
• Barcode: 9319924472895

Fitment Information:

• Universal fitment - fits any vehicle with an 18mm diameter sway bar
• Note: Verify your sway bar diameter is 18mm before ordering
• Note: Measure your existing sway bar or consult your vehicle's service manual to confirm diameter
• Common 18mm applications: Many Nissan, Toyota, Honda, Subaru, Mazda, and Mitsubishi models use 18mm sway bars - verify your specific application
• Installation: DIY-friendly with basic mechanical knowledge

What's Included:

• Whiteline sway bar mount bushing (W21999-18) - single bushing
• Note: Most vehicles require 2 mount bushings (front) - order quantity accordingly
• Note: Grease recommended for installation - use a quality synthetic grease

Installation Notes:

• Raise and support vehicle safely
• Remove sway bar mount bracket bolts and bracket
• Remove old rubber bushing
• Apply grease to inner surface of new Whiteline bushing
• Install Whiteline bushing onto sway bar
• Reinstall bracket and torque bolts to manufacturer specifications
• Repeat for opposite side if replacing both mount bushings

Why Replace Sway Bar Mount Bushings?

The sway bar mount bushings clamp the sway bar to the chassis or subframe, holding it in position while allowing it to rotate as the suspension moves. Factory rubber mount bushings degrade over time — they crack, harden, and lose their elasticity, allowing the sway bar to move within the mount rather than rotating cleanly. This movement introduces slop into the sway bar system, reducing its effectiveness at controlling body roll and creating a vague, imprecise handling feel. In severe cases, worn mount bushings cause a clunking or knocking noise over bumps as the sway bar shifts in the mount. Replacing worn mount bushings restores the sway bar's effectiveness and eliminates associated noise.

Whiteline Synthetic Elastomer vs. Factory Rubber:

Whiteline's synthetic elastomer material is significantly more durable than factory rubber, resisting degradation from heat, ozone, oil, and the temperature extremes experienced in the engine bay and undercarriage. The synthetic elastomer maintains its properties over a much longer service life than rubber, ensuring the sway bar mount remains secure and effective for years of use. The material is formulated to provide the correct balance of firmness and compliance for sway bar mount applications — firm enough to eliminate unwanted movement, with enough compliance to avoid transmitting excessive harshness into the chassis.

Knurled Inner Diameter - Grease Retention:

The knurled inner diameter is a key Whiteline engineering feature. The knurling creates a series of small grooves on the inner surface of the bushing that trap and retain grease, ensuring the sway bar can rotate freely within the bushing during suspension movement. Without adequate lubrication, the sway bar can bind in the bushing rather than rotating smoothly, causing noise and premature bushing wear. The knurled design ensures the grease stays where it's needed, providing long-lasting lubrication and quiet operation. Always apply a quality synthetic grease to the inner surface during installation.

Verifying Your Sway Bar Diameter:

Before ordering, verify that your sway bar diameter is 18mm. The easiest way to measure is with a set of calipers on the sway bar at the mount location. Alternatively, consult your vehicle's service manual or a Whiteline fitment guide for your specific make and model. Common 18mm sway bar applications include many Nissan (240SX, 350Z, Skyline), Toyota (86/BRZ, Supra), Honda (Civic, Integra), Subaru (WRX, STI, BRZ), and Mazda (MX-5, RX-8) models, but always verify your specific application before ordering. Whiteline offers mount bushings in a range of sizes to cover most sway bar diameters.

Sway Bar Mount vs. End Link Bushings:

It's important to distinguish between sway bar mount bushings and sway bar end link bushings. Mount bushings clamp the sway bar to the chassis at the centre mount points, while end link bushings connect the ends of the sway bar to the suspension arms or struts. Both types wear over time and can cause similar symptoms (noise, vague handling). If you're replacing mount bushings, inspect the end link bushings at the same time and replace if worn. Whiteline offers both mount and end link bushings for most applications.

Why Whiteline?

Whiteline is an Australian manufacturer of performance suspension components, renowned worldwide for their engineering expertise and comprehensive bushing and suspension product range. Their synthetic elastomer bushings are trusted by enthusiasts and professional race teams worldwide for their durability, correct fitment, and genuine handling improvements. Whiteline's Limited Lifetime Warranty reflects their confidence in the quality and longevity of their products.

Perfect For:

• Any vehicle with an 18mm sway bar needing mount bushing replacement
• Suspension refreshes on Nissan, Toyota, Honda, Subaru, Mazda, and other platforms with 18mm sway bars
• Handling upgrades wanting to maximize sway bar effectiveness
• Builds experiencing sway bar clunk or noise from worn mount bushings
• Anyone seeking Whiteline quality for their sway bar mount bushing replacement

Perfect For: Any vehicle with an 18mm diameter sway bar seeking Whiteline synthetic elastomer mount bushings for improved handling precision, grease retention, and long service life.

Pro Tip: Replace both front sway bar mount bushings at the same time — if one is worn, the other is likely close behind. Order 2 units for a complete front sway bar mount bushing replacement.

Universal 18mm: Synthetic elastomer. Knurled grease-retaining ID. Lifetime warranty. 0.2 lbs. Verify sway bar diameter before ordering. Grease required at installation.

Restore your sway bar's effectiveness with Whiteline 18mm mount bushings — synthetic elastomer, grease-retaining knurled ID, lifetime warranty.