I have mine attached to the bottoms of the JC Whitney lightbar on some aluminum angle brackets oriented at right angles to the bike and the lights bolted to this.

Here's a pic. Although you cannot see the brackets, you can see the nut for the bolt that I attached them to just above the pumpkin (ran another nut onto the bottom of the bolt)


"Never underestimate the power of human stupidity" - Robert Heinlein