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After just under a year of back and forth, I did finally get the retrofit installed on my August, 2017 production Model S at the Chicago service center. The correct part ended up being
MS FGR ROOF RACK RETROFIT KIT(1497747-00-A) and the total cost was $825 (see photo of invoice).
After I got my car back, they told me to leave positioning tape on it for a couple of days. The alignment is pretty good, and you can clearly identify the new glass by the markings indicating where to attack the crossbars (see photo). I think the car looks pretty great with it!