1965 Factory Air Pulleys and Belts

My AC Compressor has a serial number of 2843802. According to this book it was used on 1968 6 cylinder cars. The pulley measures 6 3/4" which is pretty close to what the book says which is 6 5/8".

http://books.google.com/books?id=ou...6AEwAA#v=onepage&q=2843802 compressor&f=false

This seems like further evidence that my setup was cobbled together, and not original to the car.