I've got the one from American Powertrain, it's slightly bigger than the one offered here, but it does not work with my Pro Parts headers. I wasn't able to get it into the location needed, and if I could, it would place the line coming off the master ~1/2" from the primary tube.
I ended up drilling a hole and mounting it next to the brake master cylinder.
You can see the bracket (that didn't fit) and master I was using in this pic.