Tesla part number: 1035180-00-H. Should be compatible with Model X years 2016 2017 2018 2019 2020.
Taken from a 2018 Tesla Model X. I was pulling out of the garage and hit the garage frame on the left side, cracking part of the trim on the left side.
The mirror was working fine after the impact, and the damage was purely cosmetic. The glass didn't break, and it was moving just fine. Unfortunately, just to fix the cosmetic damage, Tesla replaced this whole part with all this working electronics, and now I have to sell what they replaced, hopefully recouping some of the money I paid for the new part.
If you can use it in your car, grab it for much cheaper than a new mirror.
Sold as is, see photos for details. No returns accepted, so make sure it's the right part for you.
We live not too far from Montclair, 2 minutes away from the Broadway Terrace freeway 13 exit.