see here Top Sony - CDA K800
you custapack doesn't have to match your cda exactly, if your using HUTCH firmware then just use a HUTCH custpack doesn't really matter if every number of the CDA doesn't match, if you want there a few things you can do to change the cda number first is to open the customize.xml in notepad and edit this line <cda-number>CDA102568/11</cda-number>
or you can edit or write a script to your gdfs which will permetly change your cda number even with seus.