DRGREW

I developed a rust spot on a DW708 Saw rail and tried to find a part # for it. Could not locate one on any parts display, which led me to believe that they don't sell them. It appears to be about the only item on the machine that cannot be replaced. Has anyone ever heard about one of these being replaced on this or a similar Dewalt Sliding compound saw? Thanks for any advice or information. DRGREW