Believe this may be the results of the problem they had in the later Fords were they were "jumping" out of park. It was not unlike car companies to send out warnings, letters and stickers to all registered owners when a problem arose to cover their legal a**s
A similar thing brought about the lovely CAUTION FAN decals on many of our cars (not referring to Boss 429s or late classic Mustangs
or the yellow warning label sent out for the space saver spare we often see owners reapply
Since many of these ended up on unrestored, low mileage or nice original cars it was often assumed that they were original to the car from day one