serial number of 412137 or greater, this is the "new style arm". if you need to replace this part you and currently have the "old style arms" you will need to replace both the left and right side as well as the foot plates and stabilizer bars.
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Listed on the following equipment:
Nu-Step - T4 Recumbent Cross Trainer
Nu-Step - TRS-4000 Version 1.2 Recumbent Stepper
Nu-Step - TRS-4000 Version 1.3
Nu-Step - TRS-4000 Version 1.4
* Images may not be identical to part.