The Peterbilt 579 12 inch Sears Atlas Seat Base Adapters in PO Blue are a practical and versatile solution for enhancing your Peterbilt 579 Sears Atlas Seating. Available in chrome or billet aluminum, these adapters provide a secure and comfortable fit. With a 12-inch adapter, they are designed to fit most Peterbilt 579 models. Upgrade your seating experience with these reliable and durable seat base adapters.