WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, and 2005 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Exploded View Of Seals, Rings And Gasket Locator
Courtesy of FORD MOTOR CO.
Fig 2: Identifying Seals, Rings And Gasket Locator