Scott's was one of the first ones that are fitted to the middle of the steering/handlebar instead of one of the fork legs and a bit of the frame. Scott's and GPR are similar, too, and they're about 4" wide and 3" tall and maybe 1" thick. They're got adjuster knobs right on top of the damper so you can easily and quickly adjust from tight, for racing down the course, to loose so you can easily maneuver in the pit and onto your trailer.
Both of these bolt directly to the handlebar (area) and to a stationary "peg" mounted on the top of the frame. I'll see if I can find a picture or a link to them.