The 98 eb did not come from the factory with a CAF. The air box was sealed. However, a kit was available from Ford. This kit included the filter and a cover for the filter box. You had to carefully cut out a rectangular plastic piece on the lower end of the box and fit the filter into the box. Then attach the door. I had 98 and 2000 EB Expeditions and installed the CAF on both. I could look up the paperwork for part numbers and/or installation instructions. Remote chance, I may be able to locate the info.