Anyone get the after market K&N air filter for their wolverines? I have an 08, and multiple sites told me the part number was YA-3504. This filter fits most of Yamaha's newer 350, 400, and 450's including the Wolverine and Grizzly 450. However, I'm having a hard time getting the filter to install, the only way I can see make it fit is by cutting new notches into the airbox. I've read reviews online that people seem to be able to install these filters on grizzlys in seconds, and the 08 grizz has the same airbox as the 08 Wolverine, but I'm just not seeing it. And of course K&N has instructions on their website for every model air filter but this one. Any help is greatly appreciated.

Thanks.