This is a mount for use with any autoleveling probes that are around 18mm in diameter. The mount is attached to the print cooling fan. I am using this mount for a LJ18A3-8-Z/BX-5V inductive proximity sensor switch.
UPDATE 1/30/2017 - I added 5mm support below the mount to help keep it vertical. I noticed a problem where the sensor started to lean in toward the nozzle.
UPDATE 1/31/2017 - I extended the mount out another 1mm to allow for the washer diameter.