Just seen this and I hope you've had some sort of response elsewhere. If not, I can tell you that I've got 758s fitted on my boxeye and they don't foul the fairing, but it does depend on the angle you mount them, the levers can come close.
The problem you may have is that 758s don't give you much of a raise in hight, so you won't get a may not get a more comfortable riding position. Although I'm happy with the Renthals, which are wider, IMHO i think the standard bars were better for comfort.
