What's there to adapt? You just take the faceplate off, power off the circuit(s), remove the old switches, replace them with Caseta, put the cover back on and power it up.
I can't remember specifically but you might have to bend and break off aluminum heat sink "wings" on the sides to make room for the switches packed tight.
But before doing that, ensure you have enough current capacity in the Caseta switches for the light load. And when putting them into a tight box without the wings, you have to derate them. Read the specifications.
