To plug the holes I used the factory plugs off a Ninja 250r's brackets. I dare say there's quite a few other models that have them also given Kawasaki use fairly generic lever mounts. Any 8mm plug would work.
As for rear vision. It's 100% better. The overall amount of vision is less, but you're not looking at your shoulders. The mirrors are slightly convex too so I can see all the way from my rear indicator stalks to the car next to me.
As for the black, it's one of the two 2011 colours. I'd really hoped to be able to get a hold of a white and orange one, but no dice.