Pivot ball is inside the bellhousing. The small end of your clutch fork pivots back and forth on it when you engage/disengage the clutch. If you buy a used bell from a junkyard or something it will most likely have one in it. You can also buy them at many 5.0 parts places online or even at your local dealer. If you don't have a bellhousing already, I'm selling one with a pivot ball already installed. Great Shape.
