Genuine Mazda Front Anti-Roll Bar D-Bush – MX-5 NC PRHT • NG20-34-156

Genuine Mazda NG20-34-156 Front Anti-Roll Bar D-Bush

Replacement Genuine Mazda front anti-roll bar mounting bush for Mazda MX-5 Mk3, Mk3.5 and Mk3.75 NC Power Retractable Hard Top — PRHT — models only.

The front anti-roll bar connects the left and right sides of the front suspension. As the vehicle corners, the bar twists to help limit body roll and maintain controlled suspension movement.

This split, D-shaped rubber bush fits around the front anti-roll bar and is retained against the front crossmember by its mounting bracket. It supports and locates the bar while allowing the limited rotational movement required as the suspension operates.

As the rubber ages, it can harden, split, compress or wear internally. This may allow the anti-roll bar to move inside the mounting bracket, causing knocking or rattling noises over uneven road surfaces.

There are two bushes fitted per vehicle, one on the left and one on the right. This listing supplies one Genuine Mazda bush, so select a quantity of two when replacing both sides.

Important body-style distinction: This part is specifically intended for MX-5 NC Power Retractable Hard Top — PRHT — vehicles. Fabric soft-top models use a different bush, Mazda part number NE51-34-156. Mazda specifies a different rubber characteristic for the two body configurations, so they should not be treated as interchangeable solely on appearance.

• Part type: Front anti-roll bar mounting bush
• Common names: Front ARB bush / stabiliser-bar bush / sway-bar bush / D-bush
• Mazda catalogue description: Bush, Stabilizer – Front
• Primary use: Supports and locates the front anti-roll bar against the front crossmember
• Location: Left or right front anti-roll bar mounting bracket
• Body style: Power Retractable Hard Top — PRHT — only
• Fabric soft-top compatibility: No — soft-top models use Mazda part number NE51-34-156
• Quantity fitted per vehicle: 2
• Quantity supplied: 1 bush
• Mounting bracket included: No
• Mounting bolts included: No
• Brand: Genuine Mazda
• Part No.: NG20-34-156
• Also referenced as: NG2034156
• MX-5 fitment: Mk3, Mk3.5 and Mk3.75 NC PRHT models

Possible signs of worn anti-roll bar bushes:

• Knocking or rattling from the front suspension
• Noise over speed humps, broken road surfaces or small bumps
• Visible cracking, splitting or compression of the rubber
• Excessive anti-roll bar movement inside the mounting bracket
• Reduced front-end precision during direction changes

Fitment advice: Confirm that the vehicle is fitted with the factory Power Retractable Hard Top before ordering. Fabric soft-top models use a different Mazda front anti-roll bar bush. Compare the original bush and anti-roll bar installation where the vehicle has modified suspension or a replacement anti-roll bar.

Other items to consider: Inspect the bush on the opposite side, both mounting brackets, bracket bolts, front anti-roll bar, anti-roll bar drop links and their ball-joint boots. Bushes are normally replaced as a left-and-right pair to maintain consistent support across the bar.

Useful tools / consumables: Suitable socket and ratchet set, extension bars, penetrating fluid, calibrated torque wrench, wire brush, vehicle lift or axle stands and a rubber-compatible installation lubricant where permitted by the Mazda workshop procedure.

Difficulty guide: DIY Difficulty: Moderate. The bushes are mounted beneath the front of the vehicle, and access to the retaining brackets may be restricted. The vehicle must be raised and supported safely before work begins.

Why Genuine Mazda? Genuine Mazda anti-roll bar bushes are manufactured to match the original bar diameter, bracket profile and application-specific rubber characteristics. This is particularly important on the MX-5 NC because Mazda specifies different bushes for the fabric soft-top and PRHT body configurations.

What’s in the box: One Genuine Mazda front anti-roll bar D-bush, part number NG20-34-156. Mounting bracket and bolts are not included.

Installation notes: Raise and support the vehicle safely. Clean the anti-roll bar and surrounding bracket area before removing the original bush. Inspect the bar for corrosion or wear where it contacts the bush. Open the split in the replacement bush, position it around the bar in the same orientation as the original and refit the retaining bracket. Start both bracket bolts by hand and tighten them evenly to the applicable Mazda workshop specification. Check that the bush and bracket are seated correctly before returning the vehicle to service.