Where can I find replacement parts for an old solar outdoor Lantern?

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I have several outdoor solar lanterns that I would like to rehab. They were cheap but I love the look (especially now that they're all rusted and funky). I'm hoping I can cheaply replace just the piece with the solar panel, light bulb and Battery. It's the item at the front of the picture (here to known as the round thing).😁
I've been searching online with no luck. Probably because I don't know what it's really called!
q i need help finding replacement parts for an ol solar outdoor lantern, outdoor living
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