They are pretty rare, and the ones that are there are usually pretty corroded. It is best to get them from Mainland Japan.

You can send a bike on the ferry from Tokyo to Naha (?) for about $150, last time I checked a few years ago. It is WELL worth it.
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Paul Herr
'88 FZR4/GSXR/YZF Frankenbike
MY BIKE PICS