It'll take a couple days to come up with directions for installing the mount.oh man thank you!
In the meantime, the bars you need are 51mm with a 3 inch rise. I bought Woodcraft (12-5551-78B). You also need a 10mm spacer kit (12-spacer1.5), otherwise the triple clamp gets in the way.
Most clip-ons, including the Woodcrafts, have a negative rise (they slant downward as you move toward the end of the grip). This is a real problem for the Duke because its fairings practically engulf the upper forks. If you install the clip-ons with a negative rise, you won't be able to turn lock-to-lock. There is a simple solution with the Woodcrafts. You just mate the left riser to the right clamp. This produces a positive degree rise instead of a negative rise. It also maintains the motocross-like grip position of the stock Duke.
I set the bars with about 10 degrees sweep. With that setup, the bars are about two inches lower and four inches forward. There is ample clearance to turn lock to lock.
Let me know if you have any questions. I'll give a similar explanation of the mount in a day or two.