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You can use SMD 0805 LEDS, 2 mm lenght x 1.25 mm width x 1.1 mm height. See picture.
Or SMD 1206 LEDS, 3.2 mm lenght x 1.6 mm width x 1.1 mm height. See picture.
Or any LED you prefers.
Model size is 53.6mm lenght, 7.5 mm width and 6.1 mm height. Scale 1:25.
Made from translucent material, only the upper part should be painted. With wire cutouts in the upper part.
LEDs not included.