The fixed end of the damper mounts to a simple bracket fabricated from flat stock and clamped to the single downtube with a standard automotive muffler clamp. If memory serves, there was a particular size clamp "saddle" that matched the diameter of the front downtube, and very little detail fitting was needed. I elected to not tack-weld the bracket to the downtube, figuring if it takes a hit substantial enough to move the clamp, that scenario would be better than something else bending or breaking. Pics below....
Regards,
Kevin