The 12-inch adapter is a practical and versatile solution for fitting most Peterbilt 579 Sears Atlas Seating. Available in chrome or billet aluminum, this adapter is sold individually and offers a durable and reliable option for your seating needs. Its sleek design and compatibility with a range of seating make it a convenient and beneficial addition to your truck. Whether you're looking for a sturdy and long-lasting adapter or a stylish upgrade, this product offers both functionality and aesthetic appeal.