This plug is located on the Rear Quarter Panel Extension under the Rear Quarter Panel Air Vent  Guard. Its purpose is to seal the hole behind the vent guard and prevent any debris from entering ther guard and vent assembly. Over time this plug tends to wear down and tear. This plug is also prone to rear end and side collisions. 

Sold individually. 

Fits:

• 2017+ Infiniti Q60 Coupe (CV37)