Im currently using Rick at DRAGandDRIFT.
He's from the UK but now lives in Japan, its a new venture for him but he knows his stuff and has some very good contacts with various tuners. Infact, he's just sourced the Endless R33 for a customer here in the UK. He'll send photos and video footage and will find exactly what you're looking for. He also speaks the language (which obviously comes in handy

).
Cant speak highly enough of him. Top bloke and very trustworthy.
If you want his contact details, just let me know and I'll drop you a PM
Jeff.