Hi Vlad,
The GFS neck fit perfectly in the neck pocket of the body. I did put the tuners on first and put two high E strings on to align the neck, then clamped it into place with two wood clamps. Then I marked where the holes needed to be with an ice pick through the body holes, and then drilled the holes.
These GFS necks fit perfectly in Epi Special II bodies (well, @ least in mine it did).
The GFS neck isn’t as substantial in your hand as the original neck is, but it is comfortable enough. And the GFS neck feels more “solid” for some reason, for lack of a better word, than the original neck. And the frets definitely feel better, too.
Not bad for a $65 neck.