I picked up a couple of the fiberglass stick in the ground reflector rods. The rods are about 1/4" round, then cut them to size, drilled holes on each side each shelf then flexed them in. Works great, one each for the short top and bottom shelfs and 2 on the middle tall shelf.
Dale, Karen, 2 Boys and the Girl
2007 Jay Feather 30U Some Mods
2006 F250 Lariat 6.0 Powerstroke Diesel with mods