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Norfolk Southern ditch light housings styled after the dash 9 type, N-scale, four pairs. Designed for rear to be covered with .010" styrene after LED and wires are installed. Designed to use Ngineering micro LEDs. Link to LEDs: http://ngineering.com/lightng.htm. Also, the pico version of these will probably work but I have not tested them: http://www.modeltrainsoftware.com/smd-chip-leds.html