Looking closely at the routing plan and the old+new photos I actually think it's still the 5th. I think the clue is the steep hole in the backgound of the old photo, which according to the routing plan is the 9th and the modern photo of this hole shows a sharply uphill hole. I think these are the same.
On the 5th, the lower bunkers have been removed and the bushes behind the green have spoiled the look of the hole.