Well, just called and learned my car is scheduled to roll off the line in 3 days, with delivery in 4-5 days. (Still no VIN in code or delivery notification mind you). They said if I change the order to 19" wheels, delivery would probably move to mid-March, because cars are built in batches so I'd move to the SR+/white/white/19" line. That said, I made the change. Better to get exactly what you want and wait a bit longer than regret it.