Whether you have the Academy or the Eduard F-4C (same kit actually) there are little things that can be added to make it an even better kit. Eduard is known for its quality photoetch.
There are two brass frets are included in this set. One fret of photoetch is primarily the cockpit sill and canopy framing.
The second, larger one is an extensive upgrade for the landing gear wheel wells and doors. This is something that Academy probably should have done better, but the photoetch parts are easy to add and upgrade the area. The wheel wells are busied up to a more realistic look. Every door on the landing gear is treated to realistic pattern thanks to the PE. There are some parts for the drop tanks, missiles and bombs as well.
The fit of all the parts that I used were perfect for their application. The canopy frame required some minor bending but it added the missing detail to the canopy when posed open. The wheel wells reproduce the pattern in the wheel well.