Looks like enough Ys are dismantled that you can get these pretty cheaply on ebay now.
Should be dimensionally identical between 3 and Y, I assume the change is for strength and corrosion resistance.
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Tesla Model Y Rear Upper Control Arm Link 1188427-00-B 2020 2021 2022 2023 Oem | eBay
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Should be dimensionally identical between 3 and Y, I assume the change is for strength and corrosion resistance.