New crankshaft pulley boss, Mazda MX-5 & Eunos Roadster mk1 1.6 (later cars from Sep 1990 to 1998) and all mk1 1.8 models.
Genuine Mazda part no. B3C7-11-400.
Note that this is NOT for the early 'short nose' or 'LWSC' engine, it will only fit later cars with 8-slots or no slots in the outer pulley.
NM00855. B3C711400.