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A friend of mine owned the SL60, SL70 and SL55. I'm not sure if he sold them all but they were all Japan imports.
The SL72 was the rarest of them all with twenty something units ever made. The SL73 is the King.
@onewhippedpuppy Are you still looking and if so are you following the auctions on Bring a Trailer? There are three R129s on auction that match what you listed as your requirements.