12V temperature controller relay mounting box. 

I couldn't find a consistent model number for the unit, I purchased from Amazon here.

There is a hole for the temperature probe, as well as slots for access to the terminal screws and the wire ports.

There is enough play, if you desire, to connect the wires into the terminal block first, and then slide the controller into the mount.

The controller simply pushes in with friction holding it. I have 2 of these and they hold in well.