I would look for a SM parts car, they do show up on craigslist or eBay.

Good luck with your project. One of if not my all time favorite car and hope to own one of them one day.

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).