I have a flat wing that I'm looking to sell. It includes the Xnut and 2 Xstraps. All mounting hardware included. I set it up once on my bike and decided that rear mounted hydration systems weren't for me. I never used it once. This would be identical to :
http://www.trisports.com/xlflbakit.html

$35 shipped CONUS. Paypal or cashiers check only.
PM me back if interested.