Take them alive ,
I got that on Clarence at a Honda dealer for 20 bucks ... It fits perfect on that rack. I found one on e-bay just now ..
http://www.ebay.com/itm/Honda-Foreman-Rubicon-500-2001-04-Rear-Rack-Extensions-/330417303010 you might get lucky callin around the Honda dealers .. My set up is a Kolpin ATV Rear Basket with fold down tailgate and a
Honda Foreman Rubicon 500 ATV Rear Rack Extension attached with hose clamps. Hope that helps some