While the billet racks look nice, I'm concerned about the small mounting area.
The billet racks are nice. While it's more work, don't rule out making your own mounting for it. I used AL stock and bent it to use some mounting points on the underside of the tail. Then mounted he rack to the AL bar. It's strong enough you can lift the rear of the bike w/ it; it's also a good point to attach straps if you get the bike buried and have to drag it out.
Not the best pic, but you get the idea.