Check home depot for all of their air ducting supplies. I can't tell you what to buy, I just wandered around and built it in my head. Dont forget to get the clamps with your conical filter and a sheet of gasket material from the auto parts store too.
I kept it for a couple months and decided the K&N FIPK looked better.
You might as well just get the KKM. In the end it won't cost much more than the home depot route given the fact that a good conical filter is around 50 on it's own.