You can try www.takakairo.co.jp. Their site is in english and they will ship to the US but it'll cost ya alot.
I got a replica kit from JC Sports (when they were in business). Cost around $500 shipped to MA. The sideskirts and rear bumper will fit without any trouble but the front bumper will need to be modified or you'll need a J-Spec front bumper reinforcement. Tacoma Subaru has the bumper reinforcement for around $75 if I remember correctly. Also, the zerosports front bumper won't take the big RS foglights and you'll need the older style banana blinkers.
We are finalizing a deal with the N.A. distributor to carry Zerosports at my dealer, Flatirons Subaru. If you let me know what you are looking for I can get you the prices and availability.
I also love the Zerosports kit for the GC