The Peterbilt Exhaust Bellow is designed for OEM Numbers M66-6559 and KW-6559. With a natural finish, this product is sold individually and fits most Peterbilt models. It is compatible with both OEM and aftermarket numbers, including M66-6559, M666559, KW-6559, KW6559, 58510, 58510-KIT, and 58510KIT. This exhaust bellow offers practicality and convenience, ensuring a reliable and efficient performance for your Peterbilt vehicle.