A base plate has a generally rectangular central section, a trapezoidal lower section, a generally rectangular upper section, and similarly configured generally semi-circular side sections. Vertical bends are between the side sections and the central section whereby the side sections extend forwardly to form an angle of 90 degrees with respect to the central section. Each side section has a pivot hole and a horizontal bend between the upper section and the central section. A support wire is shaped to form central, lower and upper regions. The central region has converging legs. The lower region has an upwardly extending J-shaped hook. The upper region has outwardly extending coaxial pivot fingers received in the pivot holes.