Found this very interesting modification at a rv website, rollinrollin.com.
This mod will allow you to mount the new DirecTV 5 lnb "slimline" model dish on your existing Winegard Mount. Have not tried it myself yet but it sure looks promising! Sorry for the double-thread
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http://www.rollinrollin.com/hdtv.htm!
http://www.rollinrollin.com/hdtv.htm