Here's the year by year differences (USA versions, Canadian may have been different):
The 63 bezel had round buttons and with little punched squares in the background. There was an early version that was chrome plated pot metal, and a later version that was vacuum chromed plastic.
Here's the pot metal version in my 63 Valiant:
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Here is the plastic 63 bezel (with very faded chrome):
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The 64 bezel was similar to the 63 with the main difference being the horizontal ridges in the background. This one sold here on FABO last year:
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The 65 version went to square (or actually, rectangular) buttons, and the base was wider than the top. Still had the horizontal ridges.
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66 Barracuda and (I think Valiant) lost the ridges and squared off the perimeter. This is a picture of a restored bezel on the gcartrim.com web site. If you have a decent 64 bezel, he will restore yours for $65.
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