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DSM is outdated:
It does not refer to the cars or a body platform, DSM means "Diamond Star Motors", the 50/50 joint venture plant between Mopar and Mitsu. In 92-93, Chrysler sold their half to Mitsu and it became Mitsubishi Motors Co,
So, the since then it's been "MMC". Also, the plant made other cars then the sport coupes:

Mirages, Avengers, Sebrings, and Galants.