This is the Treadmill Doctor Drive Belt for the Version 1 Sole F83 240J/610J. Part Number: 022553. Model Number: 583886. Fits the following models: Sole, 2006 Series - F63 (563881), 2006 Series - F85 (585881), 2008 Series - VF63 (563887), 2009-2010 Series - WF63 (563888), 2009-2010 Series - WF83 (583888), 2009-2010 Series - WF85 (585888), 2009-2010 Series - WS77 (577888), 2009-2010 Series - WTT8 (588888), 2011 Series - AF63 - 2011 (563810), 2011 Series - AF65 (565810), 2011 Series - AF83 (583810), 2011 Series - AF85 (585810), 2011 Series - F80 (580810).