You could source a '93+FD diff, They came with 4.10:1, but not anything from '99+FD as they came with 4.30:1. After that, it's aftermarket.
Why would you want such a long final drive?
I have a JDM FD and can't stand how long my gears are with the 4.10:1. Just installed the '04 RX8 4.44:1 but haven't driven the vehicle yet to see the difference.
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