Actually, if i remember correctly, the E-0998 is the filter that fits a stock SVT airbox. Not the same as a regular Contour air filter which is a drop in square (flat filter)
K@N 33-2115-1 . E-0998 does not have a flange, and is a pressure fit inside the conical SVT air box. Although it is a conical filter it can only directly replace cars with SVT air boxes, not stock Contours
Below is a link to a list on the the
K@N web site that gives the dimensions of all the filters.
The RU-3130 is a conical filter with a flange.
http://www.knfilters.com/universal/univrndtap.htmGo through the list, and base your choice on dimentions of your intake...in my case, I use a RU-3130 since that's what fits the diameter of the Mirko racing intake.
Let me know if you need anything else.