wil , i can't remember the detail but somewhere out in the WWW i read that you can retro fit the cd unit into a Mk Jazz - 2002-04.
Easy way remove the current unit and check the replacement
you may not be able to use the ipod connection but there is awork around - see below
take a look at the
http://www.hondafitjazz.com/audio.htmcopy this to your browser
this is a 1st rate source of info for Jazz people
Good Luck with the change