While installing Rubbermaid's Configurations 4-to-8-Foot Deluxe Custom Closet Kit, I noticed that it didn't come with enough screws to properly attach the metal support bars to the wall.
I swung by the local Home Depot and was able to perfectly match the screws that came with the kit down to a T. They're #10 x 2" flat head phillips screws that come packaged in packs of 2 and are made of zinc.
It's too bad Rubbermaid didn't package enough screws for a product thats costs over 150 bucks -- tsk tsk.
Note: The additional screws cost about 10 bucks.