I also asked to replace my MR order with an LR a couple weeks back, and I think my car is exactly like yours (MSM Black Aero EAP) and with a 123xxx VIN too! (don't worry, I'm on the West coast so we won't bump into each other and have that awkward "wore the same dress to the same party" moment).
Anyway, how was your delivery? How many miles did your car have on it when it was delivered? Do you know if it was a rejected delivery by someone else? Mine is getting delivered in 2 days and I've got all these thoughts going through my head and pent up excitement that I have to post something to keep me busy. Thanks.