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Tail light difference between 2017-2020 and 2021?

Read all about it in the original AMER to EMEA/APAC conversion threads, and original vs refresh tailights threads.

The main differences to deal with is programming unless you dont mind a bit of spaghetti wiring and soldering.
Service Centers are not inclined to configure refresh tails on an older build date Model 3/Y or the older tails on a newer car.

One place to start:

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