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Normally, a Miata throwout bearing does not require replacement unless it has been "abused" or is noisy during clutch engagement and/or disengagement. If there is any roughness during inspection, this is good cause for replacement. From an "insurance" standpoint, as long as you are removing the transmission for clutch work, it is easier to replace the bearing at the same time, rather than perhaps refacing or replacing it halfway through the life of you clutch assembly. This bearing will fit on all 1990-05 Miatas.