This is how I setup my intake filter after removal of the airbox.
I always if possible like to retain the intake track tube to assure a smooth flow of air into the carb or throttle body.

In this case I just got a 2" PVC elbow and cut off the big ends and shortened it quite a bit and angled it down so the filter would sit a little lower. I could have probably used a short straight piece of PVC also which would have made the top of the filter touch the stock seat pan.

I used a UNI UP 4245 POD FILTER that cost me about $14.