That's neat! Harry's always up for a Challenge.
I've got two that make sense to me.

Orient Point 1899 and Plum Island 1869 . The lighthouses face each other across Plum Gut at the entrance to Orient Point for the ferry from New London. Plum Island's cliff erosion has been stabilized this past summer with riprock, and there is hope for the Coast Guard to relight it in the near future after the lantern room is redone. Both these lights are very important to the boaters and fishermen as they navigate Plum Gut.

Eaton\'s Neck 1799 is the Coast Guard lighthouse in Huntington Harbor across from Huntington Harbor lighthouse. I'm hoping that Harbour Lights has Huntington Harbour Lighthouse 1912 on their schedule for a 2006 release so the sister lighthouse for this pair would be Lloyd Harbor Lighthouse 1854 which has be destroyed by a fire in 1947 but still represents it's post with it's ruins.