I do not know where you can buy the brackets separate from the shield, but you can buy the bolt Kit for them. Something outrageously pricey too. I tried to call the folks that actually make the shield but they said call Triumph. Although I do not think they are, you might inquire about the bolt kit to ascertain if the brackets are part of that 'kit'.
Big Science, Hallelujah. Yodellayheehoo.
One word of caution: Locktite.
P.S.: Welcome to the site!
