According to Courtesy Nissan's parts webpage, Part# 62823U is "Guide Air Front -LH. The site is located here:
GUIDE-AIR,FRONT LH - 370Z (Z34) 2009+ :: Nissan Parts, NISMO and Nissan Accessories - Courtesyparts.com
The photo below from the site shows where the part goes which is at the base of the front fender. You may want to check and make sure your part is in there and if it is then you have a free extra part. Otherwise its about 16 bucks.