sloppy (wouldn't have tried these self assembled products to make sure that they can actually be assembled), this would be a 5 star product. Instead, schedule a 1/2 hour custom modification session and drill four new 1/2" holes in the corner. The offset distance is almost 3/16" at each end of the crossbars, so the well-fitting 7/16" studs on the ends of the rollers cannot be aligned.