Read the instructions,
This is a complete replacement bushing kit for the differential. Requires removal of the factory bushings from the differential housing. SuperPro Steering Rack and Pinion Mount Bushing. MIATA NA/NB Power Steering. REVIEWS (1) ADD TO CART.

CSF # Miata 42mm Two Row Radiator. MIATA NA/NBFREE bushdelimbing.clubg: Laurel MT. SuperPro Differential Mount Bushing Inserts.
Thanks for the help guys.
eliminating play in the bushings with a much easier install than full removal and replacement of the differential bushings. Install notes: Mazda Miata Genuine Competition Engine Mounts. MIATA NA/NB The differential is mounted in the car with some surprisingly flexible rubber bushings.
Replacing these with stiffer SuperPro polyurethane bushings will cut down on differential movement, which actually makes your shifting more precise due to the way the Miata's drivetrain is mounted%(1).
Jun 10, Bumping very old post to perhaps shed light.
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This is a RX7 differential housing. This is a set of factory bushings. This is the diff housing that many folks swap to and is a direct fit in the Miata. As you can see the bushings are Fore and Afft from the bushdelimbing.clubg: Laurel MT.