This sensor is mounted in behind the factory side skirts on both driver and passenger side of your 370Z, and is used to trigger the airbags in the event of a front end collision. Replacement of these sensors is required after the airbags have been deployed. 
 

NOTE: Prior to shipping vehicle VIN # will be required to confirm sensor fitment, as these sensors change mid-2013 and vary per model. This can be included in the order notes, or provided via phone call or email with attached order number.