Black. Designed for use with 516109 & 516098 (STOP-taillights); 901819 & 901839 (Mini Cateye taillights); 903387 & 903388 (Retro taillights). For Dutch (NL) and Belgian (B) license plates measuring 145mm x 210mm. Made from 1.5mm thick aluminum; with a black wrinkle powder coated finish. For left and right side use. The horizontal elongated mounting holes allow further horizontal adjustments for a snug fit on the bike. The L-shaped mount bracket is 35mm wide and made of 6mm thick material. Note: Available with a series of different mounting point diameters to best suit your specific application. - 923743 10.5mm mount hole. Lower shock mount for most japanes bikes. - 923744 13mm mount holes. Lower shock mount for many H-D models. - 923745 20mm mount holes. Wheel axle mount for earlier H-D models & customs with 3/4" (19mm) wheel axle. - 923746 26mm mount holes. Wheel axle mount for many later H-D models & Customs with 1" (25.4mm) or 25mm wheel axle.