So if the j81 option is dealer installed, How did the j81 get on the fender tag? seems more likely j81 was factory ordered then installed by the dealer to prevent damage in shipping.
The go wing, or 1971 gull wing were installed at the factory. You could have one installed by the dealer I am sure but it would not be on the data tag. The exact breakdowns on options are a mere guess as no hard records are available. I think they do have an approximation on high impact colors with a percentage but no hard numbers. The transmissions they do have hard numbers on auto/manual but they have no breakdown on 3sp vs 4sp.