Kristian,
It looks like the CCB classes are in C:\Cisco\CVP\VXMLServer\common\lib\cvp-vxml.jar or
C:\Cisco\CallStudio\eclipse\plugins\com.audiumcorp.studio.library.common_x.y.z\lib\cvp-vxml.jar
The cvp-vxml.jar file contains the package com\cisco\cvp\vxml\custelem\callback
Which contains all the CCB java classes and a few other classes (see the picture I'm posting on the forum).
I'd be surprised if you could replace the cvp-vxml.jar from CVP9 with that in CVP 8.5 - if that's what you were thinking. I would think there's some interconnection between the modified settings and some other software outside of vxml server. But, if you do try it, let me know if it works!