I would have thought the drives a little large for scale size on a 56" apache though seeing them on the 58 above they look a good fit (and a good looking apache!!). I have seen them on a 65" Expresscraft GTX and they did look a little too large on it.
I have a set of those drives on the shelf but unfortunately only have a cut down 56" apache so it would be hard to get an idea of how it would fit on mine.