Welcome to the forum, Redrock2. If your car is a US version your data card will show code 491. The air conditioner and more than likely the radio would have been added by the dealer and therefore would not be shown. Which radio do you have?
In addition to the 491 code my 1969 -chassis 007749- also includes code 440 - bumpers with guards. My car has the standard headrests but their code -573- is not shown on the data card. I believe these must be covered by the 491 code. As a matter of interest what is your chassis number?
I don’t understand what you are referring to as, “headrest cover adjustment ports”. Perhaps you can post a photo.
Again welcome to the group. We look forward to hearing more about your car.