Tower Auto Sees Wider Loss, Shares Fall  CHICAGO (Reuters) - Auto parts maker Tower Automotive Inc.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=TWR.N target=/stocks/quickinfo/fullquote"&gt;TWR.N&lt;/A&gt; said on Tuesday its third-quarter loss would be twice  as deep as previously expected because of lower vehicle  production in North America and higher steel costs.