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 the Red Baron color option, these adapters offer a sleek and stylish look. Sold individually, these adapters provide a convenient and easy way to enhance the comfort and functionality of your Peterbilt 579 seats. Upgrade your seating experience with these reliable and durable adapters.