Karl; This does not seem as easy as I thought. I just looked online at J&P cycles catalog. It lists 1" for some 2006 and some 2007 Dyna series. A different 1" is listed for some 2008-2009 Softails, and some 2010-2011 Softails. Try looking at some online parts suppliers to figure out what will work for you.
I have an appointment right now, so I can't look more. Good luck