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The steel dash (where everything is mounted to) is different between the years. If you are talking the padded dash pad there are 3 styles. 73-78, 79-83 and 84 on up. The oldest didn't have the VIN cut out due to it being on the door post. I am sure there are other differences when it comes to where the light switch is mounted as well as the dimmer switch and wiper switch moving to the steering column in 1984