90-05 Mazda Miata Complete Alignment Bolt Kit

Mazda OEM Alignment Bolt Kit – NA & NB Miata (1990–2005)

Refresh your Miata’s suspension the right way with this Factory Mazda OEM alignment bolt kit. Designed to replace every eccentric alignment bolt on the car, this complete hardware set eliminates clunks, prevents alignment slip, and restores consistent handling and steering feel.

Over time—especially with performance driving—factory alignment bolts can wear, stretch, or slip, causing your camber and toe settings to change unexpectedly. The result? Clunking under braking, wandering steering wheel position, and uneven tire wear. Replacing worn alignment hardware is essential when performing suspension work or bushing upgrades.

This kit features the updated NB-spec bolt and washer design, which supersedes the original NA hardware. These are the latest fine-thread, double-notch eccentric bolts from Mazda for improved clamping force and reliability.

Competition Use Notes

For track or autocross cars running R-compound or extreme performance tires (RS-3, Star Spec, Rival, etc.), the front forward lower control arm (camber) bolts should be considered consumable items. These positions often require torque beyond factory specs to prevent slipping, which can lead to bolt stretch over time. If bolts require repeated re-torquing between alignments, replacement is recommended. Many racers keep spare bolts on hand for track events.

Common Symptoms of Worn Alignment Bolts

• Clunking during hard braking or aggressive cornering

• Steering wheel shifting off-center after turns

• Inconsistent handling or sudden alignment changes

• Uneven or accelerated tire wear

Fitment

• 1990–1997 Mazda MX-5 Miata (NA)

• 1999–2005 Mazda MX-5 Miata (NB)

• All trim levels

Kit Includes (Mazda OEM – NAY9-28-6AZ)

• (8) Alignment Bolts – NA80-28-66ZD

• (8) Eccentric Washers – NA80-28-473A

• (8) Self-Locking Nuts – B001-39-037B