Treadmill Doctor Precor C956 Running Belt (Vers 3 & 4) Model Number C956 Review HelpfulOwl Treadmill Belts June 1, 2018September 2, 2018Exercise & Fitness, Exercise Machine Parts & Accessories, Sports & Fitness, Sports & Outdoors, Treadmill Doctor 0 Comment This fits your . Make sure this fits by entering your model number. 1 Year Warranty This is the Running Belt (Vers 3 & 4) For Precor Model C956