This article is from the Chrysler-Plymouth-Dodge FAQ, by Dr. David Zatz with numerous contributions by others.
Diamond Star models are those built by the Diamond Star (DSM)
plant in Illinois. This was a joint venture but is now 100%
MMC. The Stratus/Sebring/Avenger Coupes and Eclipse are
the only DSM models. The Stealth used some Chrysler technology
but was mostly Mitsubishi - and was all Japanese. The Colt,
Sapparo, FWD Challenger, and Ram 50 were re-badged Mitsubishis.