This product is a 12-inch adapter, available in chrome or billet aluminum, designed to fit most Peterbilt 579 seats, including Legacy Gold and Silver Series seating. It is sold individually and offers practicality and convenience. With its durable construction and compatibility with various seat models, this adapter provides a reliable solution for enhancing your seating experience. Whether you prefer the sleek chrome finish or the sturdy billet aluminum option, this product ensures a comfortable and secure fit, making it an excellent choice for Peterbilt 579 owners.