Aside from the stock OEM pressure plate this is the only other legal pressure plate for Spec Miata competition. This ACT pressure plate is an upgrade from the stock OEM unit.
MazdaSpeed p/n: 0000-0205401-SS (1.6L cars) or 0000-0205404-AC (1.8L cars).
From the GCR:
f. Clutch System and Flywheel: All cars shall use either the stock OEM pressure plate appropriate model year or the ACT pressure plate (Mazdaspeed p/n: 0000-0205401-SS (1.6L cars) or 0000-0205401-AC (1.8L cars). The unmodified pressure plate shall be bolted directly to the appropriate stock, unmodified flywheel. The 94 model year may utilize the flywheel from the 95-05 model years. Any clutch disk may be used. The minimum weight (including the pilot bearing) is 17.6 lbs for the 1.6L and 17.1 lbs for the 1.8L.