I'll bet I did see a '66 limo at one time but didn't really pay attention to it. Back then, lots of L-P limos of all types could be seen in downtown Chicago to and from O'Hare airport.
What's more amazing to me is the depth of DST's work for Ford, from out and out race cars, to limos, to armored limos, economy trial cars, the 2 rare drag race pickups, etc.