Shown here on the Hasegawa kit - much easier to locate nowadays relative to Kittyhawk's release.  However, will most likely work on both kits.
 
Features:
Scale thickness on surfaces
Huge improvement on kit part detail, including hinge detail, actuators and rivets
Gray resin for uniform paint coverage
Compatible with all major CA glues & paints
Very minimal prep (support removal) required before use
 
The FAST-FIX F-5E wheel upgrade is already available HERE. Plans are underway to produce a gear bay update set in the future.  Stay tuned!