The Peterbilt Retro Kit Replacement 7 Inch Flex is a practical and efficient solution for replacing the chrome elbow in the Peterbilt Retro Kit (PRK-7). With a 5 Inch I.D to 7 Inch I.D, this flex is designed to fit Peterbilt 359 and 379 makes and models. Its durable construction ensures long-lasting performance. Upgrade your Peterbilt truck with this reliable replacement flex, providing enhanced functionality and a seamless fit.