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The one shown in the ebay ad mounts to the down-tubes of the frame. The height is kinda dictated by the loops in the bracket. This pic: http://www.customdynamics.com/Images/7861-1.jpg is a different brand but works the same way.
I have a set I got from Kury on my FXSTC. The mounting hardware on the bar is adjustable to the frame. The clamps move along the bar, which gives you the option of mounting them high up or down low on the frame.
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