Have you considered taking in the old belt to an auto parts dealer to find a close match? It might be possible to even use the "link-belt" system, may have to change out the pulleys, this would be no biggie.
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"Whether active duty, retired, national guard or reserve - is someone who, at one point in their life, wrote a blank check made payable to "The United States of America", for an amount of "up to and including my life". That is HONOR, and there are way too many people in this country who no longer understand it." -Author Unknown