T3 spec are not "handed" - the old 5000-series had part number suffix SL and SR for slotted left and slotted right side. T3 is symetrical regardless of which direct the rotor rotates and are identified with "S" suffix. The old slots were straight, the T3 spec is curves and provides more "out-gas" points than the original design,
I understand tha the metalurgy is different (according to the DBA website).
370Z partno is DBA 52134-S is T3 spec rotor.
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