Yup, your diamante died, the same time we stopped making the magna, after all they are the same car. The 380 is the replacement for the magna/diamante. We export them to you.
Mitsubishi tired renaming it products about 20 years ago, ditching the 'sigma' nameplate and changed to the new 'magna' monkier. It made no difference to the public, 20 years ago people knew that the new Mitsubishi Magna was no better than the old and tired Sigma it replaced, and 20 years on people are no different. The public seem to be able to smell bulls*** 20 miles away.
The scenario below is a famous (in Australia) 80's question about changing car names, this was a Question from a journo to a Newly appointed Nissan Marketing Manager.
Journo: What are the differnences between the outgoing Datsun 180B and the new Nissan Datsun 200B?
Nissan Employee: Well...
And before he could give his long winded answer, another journo yells out of the crowd and answers for him.
2nd Journo: Twenty more mistakes!
Things havent changed.