Great write up and I've been following this upgrade closely. I'm assuming this works on 2016 Tahoe LT? I'll work on finding the DL3 mirrors then come back to you for the harnesses!
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Darn it, the main reason for me wanting to do this upgrade is so the seat memory would adjust the mirrors at the same time. The other features are just an added bonus.
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Sorry, I didn't see the part numbers for the DL3 mirrors anywhere, just the harnesses and switch. What are the DL3 part numbers? I want to do this on my 2016 Tahoe LT, assuming this is all the same.