The Miata shifters use the same thread pitch as S5 FC's, FD's, and RX-8's. So, by judging from your avatar pic, you have an S4 and therefore will need a new knob as well.
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1976 Mazda Cosmo RX-5
1976 Mazda Cosmo RX-5
2003 Toyota Tundra TRD
2015 Toyota 4Runner SR5
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