This is a Treadmill Doctor Belt for Lifestyler Expanse 600 Model Number: 297160, Sears Model: 831297160, and Part Number: 224019. Fits the following models: Freemotion: 600 Cardio Trainer – CTTL038040, 600 Cardio Trainer – CTTL038041. Gold’s Gym: Good Family F700 – GFTL068040. Healthrider: 500i -, HMTL311050, H 150i – HRTL393050, H100i – HRTL343050, Soft Strider EX – 831.297870, Soft Strider EX – 831.297871, Soft Strider EX – 831.297872, Soft Strider EX – HRTL29970, Soft Strider EX – HRTL29971, Soft Strider EX – HRTL29972, Soft Strider Pro – HRTL21470, Soft Trac 250 P – HETL40630, Soft Trac 275 P – HETL40730, Sure Comfort 225 P – HETL40530. Image: 10.0 – ICTL39520, 10.0 – ICTL39522, 10.0 – ICTL39523, 10.0 – IMTL39520, 10.0 – IMTL39521, 10.0 – IMTL39522, 10.0 – IMTL39523, 10.0 – IMTL39524, 10.0 – IMTL39525, 10.0 – IMTL39526, 10.0 – IMTL39620, 14.0 – IMTL59520, 15.0 Q – IMTL315040, 15.0 Q – IMTL315041, 15.0R – IMTL391050, 15.0R – IMTL391051, 15.0R – IMTL391052, 15.0R – IMTL391053, 60 GTS – IMTL59610. Lifestyler: 10.0 – 831.297041, 625 – 831.292360, Crosswalk – 831.297230, Crosswalk – 831.297231, EXPANSE 500 – 831.297430, EXPANSE 500 – 831.297431, EXPANSE 500 – 831.297432, EXPANSE 500 – 831.297433, EXPANSE 600 – 831.297140, EXPANSE 600 – 831.297160, EXPANSE 600 – 831.297161, EXPANSE 600 – 831.297162, EXPANSE 850 – 831.297190, EXPANSE 850 – 831.297191. Nordictrack: 4200R – NETL92131, CMX900 – NMTL06920, CX 1055 – 831.285090, CX 1055 – 831.305080, Powertread 1500 – 831.298800, Powertread 1500 – 831.298801, Powertread 1500 – NTTL90080, Powertread 1500 – NTTL90081, Powertread 1750 – 831.298810, Powertread 1750 – NTTL12080, Powertread 1750 – NTTL12081, Powertread 5.0 – NETL79070, Powertread 5.0 – NTTL79070, Powertread 5.0 – NTTL79071, Powertread 5.5 – NTTL99070, Powertread 5.5 – NTTL99071. Reebok (Icon): 190 RS – RBTL59110, RT 1000 – RETL16000, RT 1000 – RETL16001, RT 1000 – RETL16080, RT 1000 – RETL16081, RT 1000 – RETL16082, RT 2000 – RETL24000.