I don't know of anyone else.

Just be careful with it, as it can leave the throttle open when you don't want it to (the lady who rolled backward down Hell's Gate last year was using one, and the Jeep wouldn't stop).

With the CALMINI 3.92:1 Transfer Case Gears and Coolerman's Clutch Interlock Bypass switch, I no longer need to worry about not having enough feet to work the clutch, brake and gas

BTW, Rubicon Express sells a complete kit for about $25.