Hey HeR3tic, Kuryakyn has a couple of "hinged" clamp styles to choose from ((2 pieces with removable hinge pin) . They run about $20 each. They have a "Magnum Quick Clamp" and also what they refer to as a "P clamp. As you may see from the photo of my mounting, I choose the "P clamp" style due to the ability to "offest" the mounted device by slipping the clamp on in different orientations (the Magnum is symetrical in shape). You can find these in the JP Cycle catalog or on-line at JP Cycles. I was fortunate enough that one of the local bike shops here in town order often from JP and did not charge me any shipping, just the clamp cost. I styled the mounting bracket myself out of 1/4 x 1" and #10 ga. x 1" bar aluminum, heated & bent into the shape I desired. I had the bracket pieces powder coated "Mirror Black" as you can also see. The powder coating was to be $10 but the guy did it for free after I stated I'd put some of his advertising out at work.
PM me for more info if you wish. Good luck.
See ya.