A support structure for supporting loads on a sloping metal panel roof includes first and second side rails, an upper diverter, and a lower closure. An upstanding web of the upper diverter extends upwardly from the panel flat. An elongate lower flange extends from the upstanding web and is disposed against the metal roof panel. Opposing rib mating webs are on opposing sides of the lower flange. On a first side of the lower flange, a diversion leg of the lower flange is between the upstanding web and one of the rib mating webs. On the second side of the lower flange, the second rib mating web meets the upstanding web. The lower flange extends from the upstanding web to a distal end thereof up-slope of the lateral leg. The lower flange and the first and second rib mating webs can, collectively, define a common distal end of the upper diverter.