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 Inc. Legacy Lo Seating. Available in chrome or billet aluminum, these adapters are designed to fit most Peterbilt 579 seats. With a yellow color option, these adapters offer a sleek and stylish look. Sold individually, these 12-inch adapters provide a convenient and easy way to enhance your seating experience. Upgrade your Peterbilt 579 seats with these high-quality adapters for improved comfort and functionality.