I wasn't able to figure out the XZZ option thing, so I gave up and bought the correct part from the dealer for $115. It was a very easy fix the check engine light is off.

I tried to get the information out of the dealer when I ordered the part and they were vague about it - they just said that they enter the vin and the correct part comes up and that he didn't know if it was the xzz or not. Oh well, at least it's fixed.