you might have to search around for one since the K&N uses the hose clamp to secure the filter, most stock filters are just press on and might not seal too well on the K&N piping...
as much as I hate how amsoil conducts business and markets themselves, when I tested a bunch of air filters, their dry filter did very well, and they look like they have alot of different styles including clamp on ones like the K&N. they also claim to be cleanable with just a vacuum or compressed air. they're more expensive than a stock filter, but it might be worth looking at.