Quick truss rod length question

Kalimna

Greetings,
Short of making my own, or waiting a month or two (neither a preferred option), im having a bit of difficulty finding a dual action trussrod for my mini builds.
The closest is a 360mm, which would finish almost at 18th fret on a 22 1/4" scale (adjustment at nut, front mounted) neck. Body join at 15th fret bass side, 17th on treble (ish).
Would the 360mm be ok?
Cheers,
Adam

Nomad

How long is the fingerboard (in millimetres)?

WezV

if the fretboard covers it and it goes past the main neck shaft then you are fine.  The truss rod has very little impact once you get past the heel

Kalimna

Cheers for the quick reply. 
The fingerboard will be 397mm long. From what you say, i reckon 360mm trussrod will be fine.