Funny. I just made the same add-on.

Just got these:
http://www.ebay.co.uk/itm/2309807394...84.m1439.l2649

I looked at the same bracket that you posted but decided to manufacture it myself. Looked quiet simple so I modelled it in SolidWorks and got it cut/bent by a friend.

The wiring is still left to be done so I haven't tried them out yet.

As I understod, you hooked yours to the hi-beam so when you turn on your hi-beam the LEDs go on, right? I'm thinking of adding an extra switch so I can maneuver them separately.

Great work man!