CaptJaC
2020 Model Y
OK. No criticism on my Dremel skills. I simply didn’t care for perfection as it was hidden and it is a leased car. As you can see in the last pic (where I circled the area) is that the small shroud really isn’t the problem. However, it worked for me because it allowed some additional play with the larger shroud piece that comes straight down in front of the mirror stem. I bet if one simply made a clean cut in the blue area on the piece of the upper shroud that I circled, the M3 mount will fit no problem.
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Thanks, that was very helpful.