VSTO 2005 SE Excel Add-In example for Excel 2003

My goal is to use VSTO 2005 SE technology to create an Excel 2003 Add-In.  The links and documentation I am finding states this is possible but all examples seem to be for creating Ribbons for Excel 2007.  Does anyone have a link and/or sample code to get me pointed in the right direction.  I am using VB.Net 2005.  My solution must be an Add-In and not a document level solution which VSTO 2005 SE is suppose to allow me to do.
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