I wouldn't fret about the harmonic balancer being on the original transmission and not the Miata, I believe only S5 transmissions got those. The bearing looks fine to me.
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1993 Yamaha GTS1000
1992 Celica Turbo AllTrac
1987 RX7 Sport
1979 Yamaha G1, KM24 powered
1975 Dolmar KMS4
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