Mark, The brackets for lower support on the roadster screen bolt to the top of the lower yoke just beside and a bit behind the headlamp mount. Mine are drilled through though (from the previous owner). I imagine that a trip to the local hardware for the right length metric bolt (cant say what size that might be tho & the shop manual doesn't say either...best guess is its an M12 or M13) would be all you need to fit the brackets.
Good luck & ride easy
