Ford F100 Hubcaps. Set of four are correct for the 1957 - 1960 models, and are known as the "bottle cap" hubcaps.
The photo of the single chromed one is correct for the 1961 models. I believe that they were used up until the 1966 models, however, I did notice that some F100's from 1964 and later used the same hubcaps as the big Fords, the one with the bar in the middle. Buyers may have had a choice on which one they wanted?