WARNING: This page is about a different car, the 2004 Ford RV Cutaway, 2004 Ford Econoline, and 2004 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Seals, Rings And Gasket Locator (1 Of 2)
Courtesy of FORD MOTOR CO.
Fig 2: Identifying Seals, Rings And Gasket Locator (2 Of 2)