Genuine OEM Ford Rear Stop Light Bulb, part number 1490659. This red bulb is specifically designed to function as the rear stop light, illuminating when the brakes are applied to signal deceleration to following traffic. It is located in the rear lighting assembly. The bulb's filament and glass are manufactured to precise specifications for optimal brightness and longevity. Genuine OEM bulbs provide the correct light output and color for regulatory compliance and safety.