Where is the logic board part number and where to buy?

I'm trying to find the part number (what I call a phone number) on this logic board so I can try to hunt down a replacement Normally, they look like 821-00065-A or whatever, but I can't find it. I know Apple's internal part number starts with a 6, but I don't know what it is.

Anyone know the part number? Or where to buy a replacement motherboard? I need 512GB or higher.

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Dude I just found this bad ass list of part numbers.

https://zxwtools.com/en/ArticleInfo_57.h...

Invaluable resource.

It's an 820-01365-A

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