I'll assume you didn't mean BSA.
The brackets bolt to the chrome piece that the rear mud guard bolts to. If you're fabbing,(and someone may have a better idea - This was my plan) It would appear that a 1/4" half collar (pipe) with a 1/8" thich washer welded to one end would get you started on the anchor point. May need to cut the collar down a bit. Weld your rod to the collars.
-OR-
You can save yourself a lot of p1ssin' around and get a set of Honda Magna brackets - they're much cheaper than the Triumphs. I thing the ones for the 750 do the trick.
