Suit GQ models with RB30 & RD28T engines, and GU with RD28TI engine.
This Pivot ball screws into the input on the front of the gearbox and allows the clutch fork to engage and disengage the bearing from the clutch.
In many cases excessive wear or lack of lubrication will require the pivot ball to be replaced.
We also sell the clutch fork retainer spring and clutch fork in our webstore.