I have the truck listed in my Sig. I have a mega cannon Cai. I have an oiled filter that is round with a conical piece in front containing the gauze that you oil. My question is what would be the part number for the pro guard 7 filter or is that one the pro guard 7? And what type of pre-filter would you suggest and part number for that one as well. Sent an email a week ago but have not heard anything . Awesome Cai by the way.