This pair of 3-point hitch balls will fit Oliver and White tractors with Category II hitches.  These may fit Oliver 1550, 1555, 1600, 1650, 1655, 1750, 1755, 1800, 1850, 1855, 1900, 1950, 1955, and White 2-70, 2-85, 2-88, 2-105, 2-110. 1-1/8” ID, 2” OD, 1-3/4” width.