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The long one from left to right is the tie rod.
The short one from box to knuckle is drag link
Arm off steering box is pitman arm
Arm off knuckle is the steering arm.

First 2 are usually adjustable, with tie rod ends
The second 2 are just solid chunks of metal.

The only one you should be concerned with is the drag link. Loosen clamps and turn the center to lengthen or shorten the assembly to center the steering box when the wheels are pointing straight.