Try the little row at the Cove for the moonset on the 29th this month. It'll be a large moon and setting in the morning again (I think). It'll not be an exact match but there might be enough to say 'look further'.

It's possible that vii is the blocking stone and that the sightline is intended with this stone at your back. We might assume that the Obelisk was closely similar to the Rudston Monolith - for cardboard cutouts. These central stones are usually the first to go.