Small cavaet when using FD rotors in an FC 13BT engine...
The FD rotor bearings are different.
I dunno if it's a big deal to you, but the FD rotor bearing groove is deeper than the Kouki FC 13BT rotor bearings.
Also, I think Mazda has like a bazillion different rotor bearing sizes / part numbers for the FD rotor bearing.
The FC3S 13BT rotor bearing only has two - "normal" and "oversized".
Although this should not matter too much for a street motor, but if you're going for big power and or spin over stock redline, this miniscule fact might come into play.
Glad to hear the seller is willing to take care of the problem without much fuss...
-Ted
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