The Givi SR4114 rack works great!
Mostly posting this for future searchers - the Givi SR4114 rear topcase bracket works great on my 2015 Versys 650 LT. It's thick black steel (not chrome like some descriptions say!) and feels very sturdy. All the holes lined up and it was very easy to install.
I don't think it looks quite as good as the Kawasaki rack, but most people will never notice. And at about 15% of the cost of the Kawasaki rack, I'd definately prefer the Givi SR4114 .