The Ducati Projectors will work. My buddy did the same mod to his Aprilia fighter about a two years ago -If the ducati projectors don't work for you i've got the r6 low beams that I'd let go for cheap.
They look kind of like this:
This is going to be hard to explain, but they're set up to be horizontal so there's a metal shield inside (under the lens) that would need to be cut out if you're going to stack them.
Also, the lights are the same size, one is just recessed a couple inches.
I'm pretty jealous of the carbon fiber bits and those new cans...
I got the whole set up for $100. The mount was wrecked but I don't need it so it worked out for me. I just did and update to the build thread and the lights are almost finished. I only took pictures of the mock up. I have the aluminum mounts rough cut and fitted. I will post up pictures after I get the wholes cut and the wiring done to show them lit.Your 'Priller build is very cool; if I could "axe", how much did you have to pay for the 999 stacked light assembly?