Frameless autodimming Homelink rear view mirror upgrade for Mazda3: Installation and results 

Here is how to install part number BCKA-V7-210A into your Mazda3. This is intended for 4th gen (2019-2024) Mazda3 but it'll probably also work with CX30s and maybe CX5s.
This is an OEM part you can get from your dealer or any of the dealer websites; I got this one from eBay because it was a bit cheaper and free shipping.
Thanks for watching and I hope this helps!