A few people have been scammed on the site, Only use paypal to pay for items for sale by other members. If they will not use paypal, its likely a scam NEVER SEND E-TRANSFERS OF ANY KIND.
I bent and painted this bracket to hold out my soft bags since they can tend to lean down a bit. It is held up under the fender area by 2 small bungees (so I can remove them when I get hard cases).
I had these exact same soft bags (funny that I recognize them from the interior out view...) on my 08 Ninja 250r. Your brackets are a great idea. Mine always tended to lean down as well.