Just found this.
2005-07 4.6L 3V Mustangs were equpped with 14 bolt valve covers. 2008-present 4.6L 3V Mustangs are equipped with 9/10 bolt valve covers. Either valve cover will work on any year model. The 9/10 bolt covers will fit 2005-07 cars & 14 bolt covers will fit 2008-present cars. The...