Jimmy is 100% correct. there was a big discussion on here a few years ago about these seat packages and weather it was factory or not. someone found the answer, cant remember who but it was discovered that ford was already trying to make the bronco appeal to a wider range of customer and offered this in late 66 for that purpose. Kind of like the 72 Explorer Sport, a Special Decore, or a Twister Special Mustang/Torino, or the Cyclone 500 GT. there were many others but not alot of records regarding them. and since the 66 records were lost we wont know any for sure details about this Pony option