Welcome to the forum.
On some forums OBS is the GMT800/2001-2006 and NBS is the GMT900/2007-2014. Others do it differently. I prefer to just use the GMT number so there's no ambiguity.
Don't want to rain on your parade but you might want to check what these are going for elsewhere.
FWIW, I just got new rails and used cross-bars for less.
Are you talking about reprogramming the wheel position for the TPMS or reprogramming for a wheel diameter change?
You can do the former (see owner's manual). The latter will require either a trip to the dealer or the use of a programmer such as SuperChips or Edge.
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