it's the old race binding look and rossi used to make, still used by many pros, including their riders who do not like the new bindings (both racers and freeskiers), and as many know tanner uses them. they were discontinued after the 06/07 season and people are still upset and confused with this decision.
the measures are brake width, wider brakes for fatter skis, though you can always bend brakes so if the sizes doesn't match up dont sweat it.