The Styleside bed used in 1964 that that it sounds like you are referring to is the same as the 1957-60 series of trucks was used solely on 4WD trucks from 1961-66. It was also used in 1963 and some 1964 model year 2WD trucks during the elimination of the unibody type of pickup trucks. The more common 1964 2WD Styleside bed(double wall) is the same used through 1966 on the 2WD trucks as well as 1966 F100 4WD...which also is the only 4WD that never used the 57-60 style bed which is a single wall bed.
But to answer your question...if its the same look and length as yours...any year will work.


- cs65