Auto G/boxes

does anybosy know the difference in length between the 4 spd auto and the 3 spd 604 auto boxes ?
and also is the extension housing interchangeable so you can bolt the torque tube on to the 4spd box ?
 
ok a new question
what if any 505's came out in aus with a 4spd auto box ?
i have a feeling the wagons did but did any of the sedans have them ?
i know the sedans in the US had them but i don't really feel like trying to get one from there
 
I believe that the late series 2 gti's came out with them. question
 
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