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- Feb 2019
NA and NB Miata seats are a direct swap. All 1990 to 2005 seats are bolt-in.
The ideal dimensions for any Miata seat is a 19.5-inches base width and a 21-inches shoulder width. Perfect shoulder width depends on the height where the seat widens. You can usually get away with a maximum base length of 24 inches, a maximum base width of 22 inches, and a maximum shoulder width of 24 inches.
Required Miata seat dimensions