The product description says you have to alter the bracket for use of stock turn signals.
Since it comes with no light, I assume you can use your stock one - but the picture does not show the US version tail light being used.
I would not purchase one without getting a definitive answer, with pictures, from somebody within US who has one.
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2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs