Don't waste your time with the little filters for the airbox. I got a set of those with my toomey pipes and they suck. Most of the time after a good ride I find some of the filters in the bottom of my air box.
Here is a link to a company that makes a lid with a cut in the middle and then an outerwear stretched across the top looks really good and should not mess up your jetting to bad.
If you go with the outerwear for around the filter make sure it is the water proof version. Not sure why but they have 2 versions. That would be the cheapest way to go.
Take some pictures and post them on the site.
Hope this helps
Here is a link to a company that makes a lid with a cut in the middle and then an outerwear stretched across the top looks really good and should not mess up your jetting to bad.
If you go with the outerwear for around the filter make sure it is the water proof version. Not sure why but they have 2 versions. That would be the cheapest way to go.
Take some pictures and post them on the site.
Hope this helps