What to do with vent?

I looked through many mazda profile and I couldn't seem to find a dash wrapped in tweed mine is off to get done and I don't know how to get him to finish it up around the top defrost vent for the windshield. Any ideas or pic's of how to finish it up around the vents cause ya can't stretch it in there lol. Heres a pic of the vents im talking about.