Sonneman has a similar fixture. I'd look on Bellacor or Circa Lighting. Also, Houzz's search box gives you an option to click on "products" and you might find it there. We've got lots of products identified and you'll find lots more!
The square sink here is good. But the dark wood and frame around the mirror is awful. 6" above a countertop would look nice, but no more. Maybe 4" is best.