This Genuine GM V-Ribbed Serpentine Belt 12648981 is a high-quality replacement for your Cadillac ATS or CTS. The belt is made with precision and designed to fit perfectly, ensuring a smooth and reliable performance. The product is an OEM part, so you can trust its quality and durability. The package includes only the part reference #1 on the diagram, but it is a direct replacement for the old belt. The product comes with a 1-year warranty, and the manufacturer part number is 12648981. This serpentine belt is a crucial component for your vehicle's accessory belt system, and it will keep your engine running smoothly. Buy with confidence, knowing that you are getting a genuine GM product.