No, I'm not so clever really.
In a big nutshell though, if the car is a 12XL(later dash, four spoke steering wheel, different bumpers and grille), 12 1.4, or Virage it will have the later gearbox with lower first gear. There are a number of different gearboxes used in the AUS spec vehicles, so without the ovalplate number of the car it is difficult to give the exact type which would have been fitted originally.
Simon
Simon