If you want the jdm front you have to do it all at once" bumper, corner lights, headlights, hood, and I'm not sure but maybe the bumper beam and radiator support as well. This whole setup is usually pretty pricey.
As I said though, you can put ths lip on your USDM bumper and it will still mount. You'll just have to come up with an inventive way to hold it up a little bit in the center to make it look like it was made for it. i've seen it done and it looks good.