The E2E-X14MD1-M1G is listed as current-stage production. If your BOM calls this exact order code, there's no urgency to stockpile or hunt surplus — it's a standard catalog item.
Integration note
Unshielded construction means the sensor face must not be flush-mounted in ferrous metal. M12 pinout follows the standard IEC arrangement for 2-wire DC — verify polarity on the load side. 14 mm range is a decent reach for an unshielded cylindrical M18 package.