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Not sure teslamotorsclub is the right forum for this - we all (a few exceptions) would have Tesla service our cars for anything related to the drivetrain or battery. I just found those links via web search.
The few on here who have tried such things have failed. The only one that we know of doing such work is a guy who goes by the name of "Rich Rebuilds". Probably only a handful of people in the world.
There's the 'Want to buy' or 'Tesla parts for sale' forums. I've seen a few 3's parted out, but I doubt they'd get deep enough to get the busbars as a separate item.
The part also looks simple enough you could make it yourself.