I have an OEM 66 ornament but don't have the base. I just liked the one that said 383 on it. I guess the made the blank ones to replace on any model when broke?
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I have one like that as well, also NOS. the blank ones are slant six cars. When the guy who did my car back in the late 90s. he ran the original OEM part numbers for all the engine callout applications . And they all superseded to the same one you and I have . Thats blank
But Im afraid I dont have an extra 66 base except for the one on my car