Here's a pic of mine. Whatever you use make sure it's fairly substantial and use rubber bushings to mount it. Mine kept cracking because I didn't. Those headlights (stock) weigh and bounce more than you'd think. They need to be solidly mounted.
Jim in Italy
4"Extended Jaybrake Forward Controls
Wide Wishbone Girder Front End
Super E Carb w/Forcewinder Air Cleaner
Holographic Metal Flake Paint Job
Four Piston Jaybrake Calipers front & back
16" Carlini Apes
I got a black bottom mount headlamp and drilled the lower tree a couple thousand miles ago with zero problems. Its from jp cycle, part number 505-107, on page 297 of the 2012 catelog. Looks much better than the top mount/eyebrow and the light coverage on dark roads is way improved.
Also, height-wise, the headlamp i got is mounted directly on top of the lower tree, not the front like the bike above, so mine ended up centered between the trees and slightly back which i too was wanting.