These Peterbilt 379 Sleeper Extension Panels are a practical and functional addition to your truck. Designed for 63 inch sleepers, they are available in widths ranging from 3 to 10 inches. Made from durable stainless steel, these extension panels are sold individually and fit most Peterbilt 379 makes and models. With their easy installation and sleek design, these extension panels are a great way to add extra space to your sleeper without sacrificing style or functionality.