On a car I did years ago, I scribed the circumference of the round speakers on the black kick panels. Mounted with black screws. Drilled *many* 1/16 holes in the panel, trying to be as geometrically as possible. Just an idea.
He did say stock "looking", so of course if he has a "concours" car this would not be the way to go. But I'll tell you, looking at an angle was difficult to see the holes. And done nicely, they look similar to the way the rear package shelf does.Well - he'd be destroying the kick panels either way. If your dead set on kick panel placement I'd check swap meets or Egag for a set, keep the best ones for later, hack up the second string. They do re-pop them so not taboo to cut 'em, and next to the doors, this would be best placement.