This is a Signal-Stat Supplementary Yellow Side Turn and Marker Lamp by Truck-Lite.
Product Features and Specifications:
- Size: 6"x2"x2"
- Exceeds requirements for mid-trailer turn signal lamps
- Yellow for side turn signal and marker lamp
- Material: Polycarbonate lens & housing, Rubber gasket, 16 gauge wire
- Light Source: Bulb #3157
- FMVSS: P2, PC