The Peterbilt National Seating 2000 Ultra Ride 10 Inch Seat Base Adapters in PO Blue are a practical and beneficial addition to your Peterbilt truck. These seat adapters, available in chrome or billet aluminum, are designed to fit most Peterbilt 379, 386, 389, and 579 models with 2000 series National Ultra Ride seats. With their 10-inch size, they provide a comfortable and secure seating experience. Upgrade your truck with these reliable seat adapters for enhanced comfort and convenience.