with the panel channel 140 as best seen in fig9 11 b the panel channel 140 is a continuous piece of material such as sheet metal or plastic that includes an inside surface 142 and an outside surface 144 the inside and outside surfaces 142 144 define a thickness 146 of the panel channel 140 for example if the panel channel 140 is constructed from steel a thickness 146 of about 0 43 mm may be used the panel channel 140 further includes a first and second inwardly turned u shaped portions 148 150 these u shaped portions 148 150 are also formed to contain first and second aperture engaging portions 152 154 such aperture engaging portions 152 154 terminate at first and second panel channel edges 156 158 the aperture engaging portions 152 154 further include angled transitions 160 162 these angled transitions 160 162 are angled at approximately 45 u00b0 toward the outside surface 144 additionally the panel channel 140 includes a first and second foot portion 164 166 such portions 164 166 are connected to one another by a cross web portion 168 the distance from the inside surface 142 of the web portion 168 to the angled transitions 160 162 is approximately the same as the predetermined distance 134 furthermore cross web portion.