SPL Parts SPL EL NC Eccentric Lockout Rear Alignment Kit for 06-15 Mazda Miata

Vehicle Fitment

• 2006-2015 Mazda Miata MX-5 (NC; Sport/Club/Grand Touring/SE; RWD)
• 2003-2012 Mazda RX-8 (FE; Base/Grand Touring/Sport; RWD)

Fitment Notes

• Rear eccentric lockout kit requiring adjustable rear camber and/or toe control arms
• Prevents OEM eccentric bolt slip under high cornering loads to maintain rear alignment
• Wheel alignment recommended after installation to ensure proper geometry

Features

• CNC-machined eccentric lockout plates from high-strength 6061-T6 aluminum for durability
• Eliminates stock eccentric bolt rotation to lock alignment settings precisely
• Supplied with zinc-plated grade 10.9 bolts and locknuts for zero-slip performance
• Helps retain rear camber and toe alignment under aggressive driving conditions
• Improves suspension predictability and reduces unintended alignment changes
• Made in the USA for quality and precision
• Compact design fits neatly at OEM rear eccentric locations
• Supports performance suspension setups with adjustable arms installed

Specifications

• Brand: SPL Parts
• Part Number: SPL EL NC
• Application: Rear eccentric lockout alignment kit
• Material: CNC-machined 6061-T6 aluminum lockout plates, zinc-plated grade 10.9 hardware
• Position: Rear suspension eccentric adjustment points (camber/toe)
• Fitment: Mazda Miata MX-5 NC 2006-2015; Mazda RX-8 2003-2012
• Drivetrain: Rear-Wheel Drive (RWD)

Included Components

• 4x Aluminum eccentric lockout plates
• 4x Grade 10.9 bolts
• 4x Locknuts and washers

Product Description

The SPL Parts SPL EL NC Eccentric Lockout Kit is a precision suspension component upgrade engineered to eliminate the common issue of stock eccentric bolt rotation on Mazda Miata NC and RX-8 rear suspension setups. Standard Mazda eccentric bolts can slip under heavy cornering or spirited driving, causing unwanted changes to rear camber and toe alignment. This kit replaces those OEM eccentrics with robust CNC-machined 6061-T6 aluminum lockout plates and high-strength hardware to lock your alignment settings securely in place.

Designed for vehicles equipped with adjustable rear control arms, the SPL EL NC helps retain the suspension geometry you've dialed in by preventing unwanted eccentric movement. This results in improved handling predictability, reduced alignment changes during hard driving, and ensures that your rear alignment settings stay stable between adjustments. While the lockouts do not provide additional adjustment range, they are an essential add-on for performance suspension setups where precise alignment holds paramount importance. A professional wheel alignment after installation is recommended to confirm optimal performance and handling characteristics.