The mounting for the audio switches (and the marker beacon lights and switches), is already in place behind the eyebrow panel plastic. You just drill holes in the plastic to match.
Ah, I see - but I have the older panel with none of those provisions (see attachment). Not that drilling holes in the aluminum is an insurmountable task, but it's a somewhat crowded panel as it is with no convenient location for a row of switches. I'm still struggling with where to mount extra circuit breakers without losing the glovebox!
