Ha! Try finding new parts for a car that is 41 years old! Oh, hang on, I just did, 1 minute ago!!
Seriously though, I swear by importmonster and am a regular buyer through them. Service is fantastic and they provide an easily searchable yahoo listing.
I can bid in realtime just like on ebay, find items I would never find anywhere else, and know it will arrive safely either by EMS or container. Yes it is more expensive, but I don't mind paying for the service and peace of mind.
My understanding is that to join yahoo auctions, you need to have an address and bank account in Japan.