The Peterbilt 579 12 Inch Seats Inc. Legacy Lo Seat Base Adapters are a practical solution for upgrading your pre-July 1st 2018 Peterbilt 579 seats. Available in chrome or billet aluminum, these adapters are designed to fit most Peterbilt 579 Seats Inc. Legacy Lo Seating. With a PO Blue finish, these adapters offer a sleek and stylish look while providing a comfortable seating experience. Each adapter is sold individually, making it easy to customize your seating arrangement. Upgrade your Peterbilt 579 seats with these durable and versatile adapters for enhanced comfort and functionality.