Most tooling is interchangeable between Mesa’s SureTorque ST-S3 and ST-120S. There are certain situations when they will not be interchangeable. For example, if you own an older ST-120S model that has the “standard” clamps, the mounting is different from the parallel clamp mounting.
Examples shown below:
Parallel/centering clamps: (pros: tool less / quick clamp change, no setting to document, con: need centering locator base for best result. But you can turn that into a pro by up-selling the benefits of the automatic product detection)
Standard Clamps: (cons: need Allen wrench to change over, right and left positions must be documented)