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Any luck? You'd think that if the door fits, the handles would swap out too. But I wouldn't hold my breath.
You might try searching for the part numbers for the Terraza and Relay door handles and see if they match up at all.
You didn't say what year yours was, but rockauto.com has Dorman brand door handles for both the Relay and Terraza and some of them have the same part number (at least for the 2007s that I searched for)..
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