Rear Subframe Brace Bar • MX-5 MK3/NC (06-15)

MazSpec Aftermarket Rear Subframe Brace Bar

Replacement rear subframe brace bar for Mazda MX-5 Mk3 / Mk3.5 / Mk3.75 (NC) models listed in the compatibility table.

The rear subframe brace bar is fitted underneath the rear of the vehicle and helps tie the rear subframe area back into the main body structure. It supports chassis rigidity around the rear suspension/subframe mounting area and helps maintain the factory structure that Mazda designed into the NC platform.

There are typically two rear subframe brace bars fitted per vehicle. They sit diagonally between the rear subframe area and the underside of the body/sill structure, one on each side of the car.

This part is commonly replaced when the original brace bar is heavily corroded, weakened, bent, damaged during underbody work, or no longer suitable for MOT/roadworthiness due to rust. On ageing MX-5 NC models these rear brace bars are a common corrosion point, especially on cars exposed to winter road salt, standing water or poor underside protection.

• Part type: Rear subframe brace bar / rear cross bar / underbody brace
• Primary use: Rear subframe-to-body bracing and chassis reinforcement
• Location: Rear underside of vehicle, between rear subframe and body/sill area
• Quantity per vehicle: 2
• Brand: MazSpec
• Part No.: MCS0002
• Also referenced as: NE5128E90
• Designed for Mazda MX-5 Mk3 / Mk3.5 / Mk3.75 (NC) applications listed in the compatibility table

Fitment advice: Designed for the Mazda MX-5 NC variants listed in the compatibility table, covering Mk3, Mk3.5 and Mk3.75 soft-top and Roadster Coupe / PRHT models with 1.8L L8-DE and 2.0L LF-VE petrol engines. This is a rear underbody brace bar used as part of the rear subframe/body bracing arrangement, with two fitted per car.

Other items to consider: When changing this part, you may also want to consider purchasing related items such as the brace bar mounting bolts, underbody fixings, rear subframe hardware, penetrating fluid, rust treatment, cavity wax or underbody protection products. If both brace bars show corrosion, replacing them as a pair is usually the most sensible approach.

Useful tools / consumables: Vehicle lift or axle stands, socket set, breaker bar, torque wrench, penetrating fluid, wire brush, impact tools where suitable, rust treatment, underbody protection, safety glasses, gloves and workshop towels.

Difficulty guide: DIY Difficulty: Moderate. The brace bars are external underbody components and are generally accessible with the car safely raised, but corrosion and seized fixings can make removal more difficult. Correct support of the vehicle and careful handling of rusted fasteners is important.

Why MazSpec Aftermarket? 

The customer is at the centre of everything we do. When it comes to our own sourced in house products, quality and customer piece of mind are out number one priority.

All our vendors are vetted to the highest standards and are ISO and IATF certified to ensure quality in every component. We have called upon our years of engineering experience in the automotive industry to make sure all components are manufacture to the exact same specification and tolerances as the original product and will not be beaten by an inferior brand. 

At MazSpec, we know what matters to our customers when it comes to parts. We are able to supply the precision, durability and cutting-edge technology customers want.

Why buy from Mazspec? Mazspec specialises in Mazda and MX-5 parts, with practical experience of the common corrosion and underbody issues found on ageing NC models. We source genuine Mazda components through trusted OE channels and can help with related bolts, underbody hardware, corrosion protection and practical parts advice for the job.

What’s in the box: One Genuine Mazda rear subframe brace bar. Two are fitted per vehicle, so order two if replacing both sides. Bolts, fixings and underbody hardware are not included unless listed separately.

Installation notes: Clean the mounting points before installation and treat any surrounding corrosion before fitting the new brace bar. Apply suitable corrosion protection after installation and tighten all fixings to Mazda workshop manual torque specifications.