1967 all had rivets. Ive owned and been around hundreds of them in the past 33 years of ownership. You can see in the pictures I posted above, The VIN tags completely changed, shape size, stamping, with added black silk screening from 66 to 67.

I'm not a 66 owner so I don't know what they had wonder if it is a build date or build plant. I looked up about 8 1966 cars at the same dealership, all had rivets, some were round head, most were the rosette type.

You know it is a potential problem when people and law enforcement don't know the early Mopar VIN tags had empty holes.