There are a number of different dial indicators holders out there for your Replicator when leveling your platform.
However, dial indicators and magnets come in different sizes.
This design is inspired and pays homage to the other holders out there, but is fully parametric to fit your needs.
You can change magnet size, dial indicator holder size, wide or narrow holder and also if you want a 2 or 4 magnets holder.
If you have small 12mm diameter x 1 mm thick magnets and a 9.5mm diameter collar dial indicator and want a beefy holder, then just print the stl.
Otherwise download the scad, change the settings, print and push in or glue the magnets in place. I printed at 50% fill for strength.