This Genuine Differential Spacer No.1 for Mazda MX-5 NC is a precise replacement, maintaining proper spacing for optimal differential function. Rebuilding the differential may require different spacers to ensure the correct alignment. Misalignment can cause issues with the differential. To sustain the integrity of your MX-5 NC's differential system, replace the worn spacer with this genuine part. It is easy to install and ensures accurate spacing, contributing to a smooth drivetrain operation.