[Tx Firefighter]

No special tool needed for the knockouts really. I have done a lot of them and usually just use a prybar. Stick it in the slot and lever it sideways and it will snap them out. Once you remove the upper control arm you'll see what I'm talking about. The factory holes allow some adjustment but the knockouts allow full adjustment. The knockouts are already setup to be removed so it doesn't take much effort to snap them out of the holes.

https://www.youtube.com/watch?v=8uu6P8aA5nk