If you were able to read this, you could see that the option one five speed [F5C56A] box has only four parts that are different from the standard five speed [F5W56A] & these were available separately at one time to allow conversion of your stock box.

Does anyone have a listing of the stock five speed ratios. I have the option one ratios, but I would like to compare them to see the difference.
Only third & fourth gear are directly changed, but it's possible that the constant mesh ratio was also changed, which would affect all of the intermediate ratios.