Frame Rail Brace Backing Plate Kit for Mazda Miata NA/NB (1990-2005)

To purchase the NA/NB Miata Frame Rail Braces without the Backing Plate Kit, please click here.

Upgrade your Mazda Miata Frame Rail Braces with R Theory Frame Rail Brace Backing Plates, designed to improve stiffness and durability. These plates act like oversized washers, spreading the load across a larger surface area compared to small washers on the thin OEM sheet metal.

🔧 Key Features:

✅ Increased Frame Rail Rigidity:

• Distributes pressure evenly to reduce stress on your Mazda Miata frame rail.
• Provides better support than standard small washers.

✅ Low-Profile Carriage Bolts:

• Allows the use of smooth, low-profile bolts that prevent carpet wear.
• Ideal for any Mazda Miata Frame Rail Backing Plate setup, regardless of the frame rail brace brand.

✅ Enhanced Aesthetics:

• Adds a clean, polished look if your carpets are removed.
• Slotted top plates accommodate various frame rail manufacturers.

📦 Kit Contents:

• 4 Stainless Steel Top Plates (2 per frame rail)
• 24 M8 Zinc Carriage Bolts
• 24 M8 Washers
• 24 M8 Stainless Steel Lock Nuts

📌 Compatibility Information:

• Verified Fitment: Compatible with V2 Flyin’ Miata rails.
• Unconfirmed Fitment: V1 Flyin’ Miata rails (contact us to verify).
• Fits most Mazda Miata frame rail brands – reach out via email for confirmation.