Door data tags, also called Vehicle Certification labels, are located on the inside face of the driver's door. These offer really good information on some of the options
a particular car was originally equipped with, and can also aid in the identification of a Special Service Mustang. Here is a guide from Ford literature showing how the labels are decoded, followed by pictures of actual Special Service Mustang tags:
Image courtesy of the 1984 Ford Car Specifications book.
1983 Colorado State Patrol Door Data Sticker, DSO 76-0029.
1993 Florida Highway Patrol Door Data Sticker
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