hey guys.. what part number is your K&N filter you use for your cai from the how-to article?

I was looking at the k&n website and i see a whole lot of different ones. I'm not sure what filter i should use. They give a list with:
Flange Inside Dia. (F) Outside Dia. (D) Length (L) Top Style Flange Length (FL) Flange Angle (FA) Flange Offset

What size filter would be best?
A part number would be great. >>