Figured this out on my Y and procedure should be the same on the 3 if anyone is interested:
teslamotorsclub.com
Successful retrofit of passenger lumbar on 2021 Model Y
Hi all, I wanted to jot down quickly some notes on my successful passenger lumbar retrofit. I will edit with more details after I get some sleep. All in all, it took about an hour for me to figure out and take things apart and put them back together. Decontented Model Ys have a the lumbar...
teslamotorsclub.com
