I can't answer your question but I'm sure someone will be able to - Thunderbike probably know; give them a call.
But I just wanted to say that I have noticed a few bikes with these bars fitted and in many case they've been pushed forward a little - not just to provide greater reach but also to improve the angle of the grips. Apart from looking a bit odd (not aligning directly with the forks) that could also impact on whether you'd have them with a fly screen. Just something to think about if you think you might need/want to push them forward.
Email:
parts@thunderbike.co.nz
Phone: +64 3 548 5787 or +64 3 548 5187