Please note that Stages Super Record 12-speed power meters should only be used with Super Record 12-speeds cranks. This is because the threading for Super Record cranks is reverse threaded.
The Stages Record 12-speed power meters however have normal threading. So they will make up with Record 12-speed cranksets as well as with Chorus 12-speed cranksets.
Please note, whenever you are installing a left side power meter crank arm, you need to confirm you have 10mm of clearance between the left crank arm and the chainstay in order for the sensor to clear. Please see the image below.