Fb, Fc, Fd ???
#6
Driving RX7's since 1979
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OK, I'll answer this one......
FB, FC, & FD come from VIN number designations. The FB came alone when the VIN went to 11 digits in 1981. Prior to 1981, the VIN was only 9 digits. Under the 9 digit system, the designation for the RX7 was "S". But, the alphabetical order was otherwise maintained with the "A".
There, mystery solved.
There, mystery solved.