Genuine Mazda Underbody Y Crossmember / Chassis Brace & Bolt Kit • G-NC0-5-002

Genuine Mazda G-NC0-5-002 Underbody Y Crossmember / Chassis Brace & Bolt Kit

Replacement Genuine Mazda underbody Y-shaped crossmember, chassis brace and mounting-bolt kit for Mazda MX-5 Mk3, Mk3.5 and Mk3.75 / NC models listed in the compatibility table.

The structural steel crossmember connects the main chassis rails beneath the gearbox area. It reinforces the centre section of the vehicle underbody and helps maintain the correct relationship between the original chassis mounting points.

The brace is fitted underneath the vehicle between the main chassis rails. There is one crossmember fitted per vehicle. This complete kit supplies one Genuine Mazda crossmember together with the four Genuine Mazda mounting bolts required to secure it.

Corrosion is a common reason for replacement, particularly where road salt, trapped moisture or damaged protective coating has affected the original steel brace. Severe surface corrosion, perforation, distorted mounting points or previous impact damage can weaken the component and may result in an MOT inspection failure.

• Product type: Underbody Y-shaped crossmember / chassis brace and mounting-bolt kit
• Primary use: Underbody reinforcement between the main chassis rails
• Location: Beneath the vehicle
• Position: Below the gearbox / transmission area
• Quantity per vehicle: 1 complete kit
• Quantity supplied: 1 crossmember and 4 mounting bolts
• Crossmember supplied: NF53-56-E00B
• Mounting bolts supplied: 4 x 99463-0820
• Brand: Genuine Mazda components
• MazSpec kit SKU: G-NC0-5-002
• Crossmember OE reference: NF53-56-E00B
• Also referenced as: NF5356E00B and 994630820
• Crossmember supersedes: NF53-56-E00A
• Fitment note: Complete replacement brace and mounting-bolt kit for the Mazda MX-5 NC applications listed in the compatibility table

Fitment advice: Inspect the four mounting points and surrounding underbody structure before installing the replacement brace. Significant corrosion around the captive threads, mounting holes or adjacent floor structure should be repaired before the new component is fitted. Clean the mounting threads carefully and ensure the brace is positioned correctly before tightening the supplied bolts.

Other items to consider: When changing this part, you may also want to consider purchasing rust converter, corrosion-resistant primer, chassis paint, seam sealer, underbody coating and cavity wax to protect the brace and surrounding chassis structure.

Useful tools / consumables: Vehicle lift or suitable axle stands, socket set, breaker bar, torque wrench, penetrating fluid, wire brush, thread-cleaning tools, rust treatment, primer, chassis paint and underbody protection.

Difficulty guide: DIY Difficulty: Moderate. Access is straightforward once the vehicle is safely raised, although the original bolts may be heavily corroded or seized. The surrounding mounting points must be structurally sound, and the replacement brace should be secured using the supplied bolts tightened evenly to the Mazda-specified torque.

Why Genuine Mazda? Genuine Mazda chassis components are designed to match the original vehicle specification, brace profile, mounting-hole positions and surrounding chassis attachment points. The supplied Genuine Mazda bolts provide the correct thread, dimensions and mounting compatibility for the replacement crossmember.

What’s in the box: One Genuine Mazda NF53-56-E00B underbody Y-shaped crossmember / chassis brace and four Genuine Mazda 99463-0820 mounting bolts.

Installation notes: Raise and support the vehicle securely before beginning work. Apply penetrating fluid to the original fasteners and support the brace while removing the final bolts. Clean and inspect the chassis attachment points and captive threads, treat any exposed corrosion and position the replacement brace without forcing its mounting holes into alignment. Install the four supplied bolts, tighten them evenly to the Mazda-specified torque and apply suitable corrosion protection after installation.