Yes, in Civic it's quite easy. Besides, there are quite resources available for Civic on YT and other portal. But this city, SX8 is very rare to find any such post. My guess too is that peeps here don't normally much care about Cabin Air filter. And yes you should visit plaza. I have seen various different kind of filters. It'd have been better if you can bring a sample along with you, though. Anyways, good luck.