I sent my wife to Autozone today to get oil and a filter for my '03 Windstar. I didn't know the filter model number, but I knew it was a Motorcraft and they had it there. I told her to get 5 quarts of Motorcraft 5W20 and ask at the counter for the filter number for a 2003 Windstar. The idiot behind the counter told her they would have to special order the filter and she had the wrong oil for the motor. I had her go back to where the filters are and check the book to cross reference the model and year with the Motorcraft part number, which, upon looking, was FL 400S. Whaddya know, they had a whole slew of them right there on the shelf next to the FL 820S that a lot of us use.