VSM heavy-duty turn signal switches are manufactured in the united states by the company that pioneered heavy-duty truck lighting applications. Mack trucks turn signal switch 918y998 is a direct replacement item that exceeds class a, SAE, QQC, and fmvss108 specifications. A heavy-duty construction and heavy detent provide a better feel to the driver when signaling while durable long-lasting contacts extend the life of the switch. This items matches the specification of western star OE part number 84401-3431.