A mounting structure for a solar panel assembly, having a plurality of solar panels, includes a plurality of vertical support legs and a grid assembly. The grid assembly includes a plurality of north-south members and the east-west members. The plurality of north-south members include a plurality of elongated slots to allow attachment to the vertical support legs despite any manufacturing tolerances that may exist in the components. The plurality of east-west members include a plurality of elongated slots to allow attachment to the north-south members despite any manufacturing tolerances that may exist in the components.
