As the other posters have said, both features were options. I have a bench seat in mine and more times than not, people will tell me that I have the wrong seats in the car simply because they are "rare". (I don't know if that is a good thing or not) (If it's in good shape, and you like it, BUY it). Mark.
http://www.classic-mustang.net/ReadersRides/MarkMustangs.jpg
http://www.classic-mustang.net/ReadersRides/MarkMustangs.jpg