I have been looking for this information. I asked at council reception for this information and was told by the receptionist that this is Banyule Council now, not Heidelberg, so we do not have that information. You will have to go to the Historical Society.
Most information that I received around the area (I used to live in Liberty Parade) was that Oriel road was not the eastern boundary, it was Donaldson Creek.
Would be very interested in your return comment.