I feel your pain. A year ago I went through this exactly. 1.6L comes with something smaller, SE-R has AD18s, NX2k has AD22. From what I've seen, the 'smaller' size is the correct size (when they say it has the 2.0) and the 'larger size', the one you got is the NX size. I'm sure they were like 20 bucks more for the larger ones, right?