i'm going to use Classic Instuments in my 67. they make 3 3/8" guages that can fit the center hole, i've seen a lot of people use their clock in that spot. i just measured all the holes in my bezel the other day. all the holes "tunnel" down into the dash so the front of the openings are larger the the backs of the opening.
large holes : 5" down to 4 5/8
center: 3 3/4 down to 3 1/2
small holes ( i didn't pay much attention to these as i'm only using a 3 hole bezel in my truck. i think these measurements are correct): 2 5/8 down to 2 1/8
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