This is the replacement walking belt for the Horizon CST-35 Treadmill. Part Number: 004264-A. Used on the following models: Advanced Fitness Group: 1.0AT - TM319 - 2008. Horizon: Club Series - CST3 - 2005 (TM119), Club Series - CST3.5 - 2006 (TM160), Club Series - CST4 - 2005 (TM117), Club Series - CST4.5 - 2006 (TM161), Freespirit - 30517 - 2006 (TM189), HZ Series - T10K - 2006 (TM170), HZ Series - T52 - 2005 (TM113), HZ Series - T53 - 2005 (TM114), HZ Series - T62 - 2006 (TM157), HZ Series - T63 - 2006 (TM158), HZ Series - WT751 - 2007 (TM279), HZ Series - WT950 - 2006 (TM153), HZ Series - WT951 - 2007 (TM286), Limited Series - T805 - 2005 (TM121). Smooth (1984-2014): SMT6.1P Folding Treadmill - TM113B - 2005.