The Fit 97-10 Ford Explorer Ranger Mustang Mazda Mercury 4.0L Timing Chain Guide is a direct replacement guide rail designed specifically for Ford, Ranger, Mustang, Mazda, and Mercury vehicles with a 4.0L engine. The interchange part number is 7U3Z-6A257-A, ensuring a perfect fit for your vehicle. With this timing chain guide, you can trust that your engine's timing will be correctly aligned, providing smoother and more efficient performance.