Two (2) New GM Part # 3743349 Z Bar Ball stud Seats.
New seats to rebuild your equalizer shaft. If you replace these before they are too worn, you can reuse the ballstud.
Only 1 of these sets (2) are needed per zbar (equalizer or bellcrank). GM NEVER put one of these on the engine side. If you do there is no way of keeping it in place, and will only create problems, when it gets jammed in the zbar.