The Peterbilt 579 12 inch Sears Atlas Seat Base Adapters, also known as the Red Baron, are a practical and durable solution for fitting most Peterbilt 579 Sears Atlas Seating. Available in chrome or billet aluminum, these 12-inch adapters are sold individually and provide a secure and stable base for your seat. With a focus on functionality and compatibility, these adapters are a reliable choice for anyone in need of a sturdy and reliable seating solution for their Peterbilt 579.