Right. And since when did they start drilling huge finishing holes in the center of
neck joints on 550's? The neck will not intonate on that body. The body is made for only a 1 fret overhang, so the fretboard must be going into the
neck pickup route right now. If it was a 22 fret EX, (looks like it was, but I can't tell without measuring) then you can cut the last two frets off the 550 neck.
Anyway I'm a little tired to get deeply into it, but basically those don't work together, and it's a Korean, non-5xx body.