Almost everything German/Italian and hi-po is always LHD in Japan, pretty much full German-spec except that the lights are aimed in the other direction for a RHD car and you'd have to swap in the German ones. Hell, even Bentleys and RR's are LHD in Japan. It's an old-school status thing. The E30 M3's in Japan came with the Getrag dogleg tranny that American ones didn't have. There are a lot of trashed out, heavily modded BMWs in Japan, but back in the day they at least used nice parts. There are a lot of nice all-stock cars in Japan though too.
There used to be a lot more E30 M3's in Japan on yahoo used cars but they are becoming rare these days. Just fewer left on the roads. I've seen some beauties over the past few years though. This one has 76,000km's on the clock and is listed for about $30K, give or take.