Hello & Welcome to Just Answer,
Sorry to hear of the loss of the part of the device charger,
Finding that particular part may be very difficult, but fortunately you can get an entire replacement charger at several online sources, and perhaps locally IF you have a store in the area that carries a LOT of Garmin devices.
Here is a link to Amazon where you can get the charger for a good price.
Click here --> http://amzn.to/2eejE8M
I hope this helps. Please let me know if you have any more questions.
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