Here’s the needed hinge parts for your system:
* [https://www.thebookyard.com/product.php?cPath=256_103_532&products_id=15873|MacBook Air 13" Hinge/Clutch LH - iSight/Antenna Cables, Apple P/N 661-02397]
* [https://www.thebookyard.com/product.php?cPath=256_103_532&products_id=13243|MacBook Air 13" Hinge/Clutch RH - LVDS Cable (13-17), Apple P/N 661-02397]
Often the screws are just loose, sometimes the clutch mech seized which will require new hinges.