a mounting device including one or more longitudinal support members slidably coupled to said longitudinal support member , and at least one pinch bracket , said pinch bracket having at least one elongated portion , said elongated portion at least partially disposed inside the lateral support member . the pinch bracket may be disposed around one of the longitudinal support members and formed so that a portion is the same shape as the longitudinal support member and fits over the exterior of the longitudinal support member . the support members may be formed from extruded plastic or extruded metal and include a support structure for holding the bracket in place .