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There are 40 entries now and I can clearly see that number does match to a lineup of some sort. Obviously it is also determined by region but this is a pretty good list now!
Being at 551xx seems accurate that the number starts at 300 or 350. I knew I was right on the cusp of the 200k full tax credit. Here's hoping I can somehow move up a few spots to get the full $7500!!
I have just added mine to the tracker:
Model S owner. Reserved in Switzerland (in store) on 3.31.2016 at 09:17 CET (03:17 EST)
Reservation ID is: 365XXX
It may be worth making a short bullet-pointed list of instructions of how to find out the reservation_id and submit it to the tracker and post that in other M3 threads. Takes 5 mins to write instructions but will save you much more in having to manually change incorrect submissions.