Treadmill (Running Belt) Walking Belt Compatible with Lifestyler Expanse 500,550, Model 297430,297431,297432,297433,297152.Fits the following models: EXPANSE 500 - 831.297430, EXPANSE 500 - 831.297431, EXPANSE 500 - 831.297432, EXPANSE 500 - 831.297433,EXPANSE 550 - 297152,EXPANSE 550 - 297150