Improved Performance: 2003-2007 6.0L models can't reach their full potential due to poor quality factory parts holding them back. The 6.0 Blue Spring Kit upgrade helps you safely and effectively increase total pressure by up to 15% to give your ride a performance you never thought possible. The Perfect Fit: Blue spring kit with billet spring housing specifically designed for 2003-2007 6.0L models to provide a secure, reliable installation to increase performance and improve fuel economy. Replaces Part Number 3C3Z-9T517- Color: Blue Material: Metal Package Contents: 1x Spring Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.