The Mack Turn Signal is a reliable and durable product that serves as a direct replacement for OEM# 1MR571. With its 12V standard and modular plug-in feature, it allows for easy OEM replacements without the need for rewiring. The 7 wire harness ensures compatibility with most Mack truck applications. This practical and efficient turn signal is sold individually, providing a cost-effective solution for your truck's signaling needs. Trust the Mack Turn Signal for its reliability and convenience, making it an essential component for your truck.