This section contains information about necks and related hardware.
This is definitely a "frequently asked question", so here are the answers:
Newburgh/Nashville neck: 15"
Music Yo/Moses neck: 16"
Newer Spirits, Synapse and ZT3's: 14"
Steinberger guitar necks: Drill patterns (PDF)
Tutorial: Replacing neck inserts on a Newburgh or Nashville neck
Obtaining neck inserts for Steinberger necks
Fretboard radius of Steinberger guitar necks