are you talking about a headlight without the top half cover thing? im wanting to know the same thing doesnt look to hard though drill a hole in the middle of your lower tree and tap a thread and wire it up

 

It isn't hard to do but you have to drill a mounting hole on the lower triple tree.
1. Jack up the bike
2. Remove brake caliper, front wheel and fender
3. Find the center of the lower triple tree, center punch it
4. Start with a small 1/4 drill bit, make sure your first attempt goes straight
5. Go 2 sizes up drill bit at a time until you have the right mounting bolt size
6. Mount the headlight, most after market lights are self grounded, all you have to do is wire the hi and low beam, just hide the factory ground wire
7. Install the wheel, caliper and fender, headlight aiming
It is an hour job, not hard at all.