Unfortunately we do not sell the EZ combo balls separately. The reason for that is that the bending tolerances in production are not the same for each shank, so each shank and combo ball is 'married' here in the factory so they fit well. If we send out a separate combo ball, there may be an issue with it not fitting perfectly with your current shank. If you live near us, we could fit it here. If not, you could ship your EZ shank to us and we will try several combo balls out until we find one that works with your current shank. 

The costs involved would be $55 for the combo ball, cost of shipping your shank to us, and then shipping back to you. 

Let us know if you're interested in one of the options above.