The Peterbilt Backup And Horn Switch Plates are practical and durable accessories for your truck. Made of stainless steel, these switch plates are available in either train horn or backup alarm options. Sold individually, they fit most Peterbilt 378/379/389 2006 and newer models. These switch plates provide a convenient and reliable solution for controlling your truck's backup alarm or horn. With their sturdy construction and compatibility with various Peterbilt models, these switch plates are a must-have for any truck owner looking for functionality and ease of use.