They fit. IIRC, the offset for the OEM 14" is +40. On the flipside, I used to use the racing wheels and tires from my EGT on my Miata. I also would use my street wheels form the Miata on the EGT from time to time (15x7 TSW blades with a +35 offset).
Miata 14" alloys are some of the lightest 14" alloys out there. You shouldn´t have any problems using them.
Miata 14" alloys are some of the lightest 14" alloys out there. You shouldn´t have any problems using them.