Yes, 2.2 for the cat 1-2 & cat 2 hooks
While the top link takes a 2" ball, they only offer a full 2" width either in a 1" or 3/4" pin size.
So if you have a narrow (under 2") cat 1 top link mount on an implement, the ball needs to be machined down for width.
This is my supplier. Top Link...