These are the latest additions to Tamiya's LED light product line specifically designed for the Tractor Truck Option Parts Series. These Light Amber LEDs reproduce the yellowish-white light from halogen lamps while the existing White LEDs reproduce the bluish white light from HID lamps.
Both Item 56521 and 56522 come with a connector to enable use with the Pick-Up Truck Multi-Function Control Unit (MFC-02) (53957) and Tractor Truck Multi-Function Control Units (MFC-01 & 03 (56511, 56523).