I've bought a Cima Y31 off Japan Yahoo Auctions
as well as about $8,000 worth of stuff!
HKS GT2510's, Apex Power FC, HKS Oil cooler, Project Mu Brake Pads the list goes on, and I have NEVER had a problem my feedback is all SUNS no rainy clouds on my account mate
If you can speak half decent japanese and you can find a willing agent in Japan your spare parts supply is set for life!