OK - I will answer the 3+ year old question...
The items pictured (I had to enlarge it to see what he was talking about) are known as the Blazer/Jimmy Rocker Box Supports and Floor Supports.
They weren't available 3 years ago though...
They can be found through the vendors and here is a link and pix of them installed.
Top two items -
http://www.gmcpauls.com/Patch_Panels.htm