The K&N filter, KN-171 (C=chrome, B=black) is the correct filter for ALL Twin Cam engines, no matter what model year or if it's a CVO or regular model.
The K&N website tends to be flaky when dealing with some CVO models, as do many others. For 2013 they list both a FLTRXSE and a FLTRXSE2, and of course they didn't offer two different CVO Road Glides that year. If you choose the first one in their drop down list, it shows it as a CVO but lists the engine as a 96. If you choose the second one it just says there are no products for that model. As I said above, the engines all use the same filter, from 1999 TC88's to the current CVO110's. I have no idea why the folks at K&N have such a hard time figuring this stuff out.
Jerry