Rare 69 CST Sport truck?

[fishyalien]

http://lincoln.craigslist.org/cto/4486389294.html

"Very Rare 1969 chevy CST-10 in 1969 chevy made 480k half ton trucks out of that number just over 280k were V-8 half ton trucks. out of that entire production number for that year they made 5000 with a special package... one that you had to sit down with the chevy dealer and order out of a book.
8 foot box special trim FACTORY BUCKET SEATS! L46 vette motor a 4 bolt main at 350 hp stock! turbo 400 automatic. dana 60 posi rear end! 3.73 gears. this truck has 125k original miles on it"

Was this a real option set?