Thanks, Erik. I'm not as angry at myself as I was. You're right, though... cover it in carpet and no one will ever see it.
I was curious about the speaker grille, too, so I look at every K5 I can to see if they have a speaker grille in the dash. This thread sheds a little light on the subject:
http://67-72chevytrucks.com/vboard/s...d.php?t=355775 .