GM: See Red, Save Green; \$7,500 Cash Back  DETROIT (Reuters) - General Motors Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=GM.N target=/stocks/quickinfo/fullquote"&gt;GM.N&lt;/A&gt; will offer  cash rebates as high as \$7,500 on some 2004 models in its new  "Red Tag" incentive program to be launched on Dec. 10 in an  effort to boost sales after two disappointing months, dealers  said on Wednesday.