Seat Back Cover. The engine types may include 4.6L 281Cu. V8 GAS SOHC Naturally Aspirated,5.4L 330Cu. V8 GAS DOHC Naturally Aspira ted,5.4L 330Cu. V8 GAS SOHC Naturally Aspirated. This part fits vehicles made in the following years 2003,2004,2005,2006.