a mounting channel member including a body having an outer surface , a pair of side edges and a pair of ends and a plurality of undercut channels extending away from the outer surface . a mounting channel member assembly wherein a plurality of mounting channel members are mounted on a supporting surface in side - by - side relationship . an anchor fastener including a body having an upper body portion and a lower body portion secured to the upper body portion , a bore in the upper body portion , and the lower body portion including first and second legs with a space therebetween with the bore being aligned with the space .