Which tie rod ends?

Had a good customer bring another near flawless restored 70 SS Chevelle by he recently did, has another about done.
He installed new AC Delco front suspension parts.
One of the tie rods was moving, and the center link was I call flopping, so it’s gonna have play in the wheel, and the tie rod will fail eventually, and if the center link gets bad and fails, you lose control of the steering.
Buy Moog and don’t look back.