That ebay light is for the 599, not the 919.
I have the clear alternatives integrated tail light, but it was already on the bike when I bought it. Not sure where the best price is. Sorry.
In my opinion, I would not rely on the integrated turn signals alone (Clear Alternatives or other). I had to keep the fender because I'm using Givi sidecases (the mount requires the use of the rear fender), so I have turn signals installed in addition to the Clear Alternatives signal.