What do you guys think...a/c dash?

[Smallz72project]

Hey, whats up everyone. I just thought of this and I wanted to see if anyone else has done or has thought about doing this. So I have a 72 non ac GMC. I really like the look of the ac dashes with the round vents on the side....but since I dont have nor need a/c I was thinking about getting an ac dash, and instead of the vents....put in speakers. I dont have any specs on the ac cabs, does anyone know the diameter of the vents? So what do ya'll think? Thanks for you input everyone.
Always keep truckin,
Todd