VOLTAGE REGULATOR.

Not sure where they get them from but National Mo-Parts in Beaverton, Ontario sells the fancy blue one and a correct looking black one for decent prices, yes, Canadian Dollar prices shown.
https://nationalmoparts.com/index.php
National Moparts

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The black one does not have the 70/71 dimple and the date code may not be exact for your car but if you're worried about those details you probably would have mentioned it.