That is weird! Maybe the expected life is so great that they do not have any plans on selling them for a few years...
I would think that plugs would be common to many vehicles.
I bought a WIX brand oil filter after one week, and had NO problem. Auto parts store had it on the shelf, so I walked out with it. Maybe I'll call on Monday to see if they cross reference plugs for it.
2012 5 Door Hatch SE
203A & Sport package with 16" wheels