Mazda rotor and stationary gear bearings are the standard of the industry. Make sure you use the right ones for your application. For 12A and 13B engines up to 1991, the standard bearing is what is needed. For 1993-95 RX-7's and 2004-11 6-port RX-8's, the multi-window is your part. We only offer them in standard diameter. Rotor bearings are the same, regardless of year and application.
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