This thread has been super helpful to me as I went through my Model Y purchase, so I wanted to share my success story in getting the 4-pin brake controller cable. First, knowing from this thread that obtaining the cable might be an issue, and since the Tesla delivery center is more than an hour and a half from home, I wanted to make sure I had done everything I could to make sure I wasn't going to walk away from the delivery without it. I started by emailing my sales advisor asking whether or not the cable would be included with the car (per the owners manual). He referred the question to his manager, who initially told me it was included, then emailed back a couple of minutes later and said that it wasn't. After a couple of back and forth emails, they committed to resolving it at delivery. Before the delivery was complete, I explained the situation to the delivery specialist, who initially tried to tell me the "wires" were already installed (she was referring to the 7-pin connector at the hitch), but after a little more discussion we finally came to an understanding. I think what helped most what that I was able to provide her with the part number from this thread (1072586-00-A). She made the trip over the parts department and had the cable for me within 5 minutes. FWIW, this was the Tysons, Virginia location, my vehicle was a Feb 14, 2021 build, and the delivery was on March 12, 2021 (so it would seem that corporate Tesla still hasn't straightened this out). Overall, the delivery was very smooth, and we're looking forward to taking our Model Y and a small travel trailer out camping this summer. Thanks to everyone who contributed to this thread!