Not specific to the Mazda Miata, these racing harnesses require a harness bar or some other method of securing to the chassis in the proper location for safety.
Cipher Racing 5-Point Harness is universal and fits most of aftermarket Racing Seats. It's designed for Safety, Support & Comfort. Quick release buckle technology makes it easy for entry & exit. The shoulder straps are long enough to extend to the rear seats of sedans or can be wrapped around a roll cage harness bar. 1 Year limited warranty
These come with a 1 year warranty against manufacturer defects when purchased through Roadster360.