The Peterbilt 3S Flex Exhaust Bellow is a practical and reliable solution for your exhaust system needs. Designed to fit most Peterbilt models, this bellow is compatible with both OEM and aftermarket numbers, including M66-7091-0335, M6670910335, 58537, 58537-KIT, and 58537KIT. With its natural finish and 3S Flex type, this exhaust bellow offers durability and functionality. Whether you're looking to replace a worn-out part or upgrade your exhaust system, the Peterbilt 3S Flex Exhaust Bellow is the ideal choice.