Something not right.
None of your pictures show a failed part.
If you can still turn one way, but not the other, you don't have a broken draglink or rod-end, if they were broken you would have no connection between the pitman arm and the steering arm on the knuckle.
Even if it was bent/bending, that would be oposite of the condition you are reporting. We are all missing something here.
Wait, I thought about it again, had to think on the pick-up push/pull steering. To turn left the pitman arm would be pulling on the dl, to turn right the dl would be in compression. I suspect the dl is bending, so when you turn left it straitens, when you turn right it bends. If the rod-end joints were failing, they would pop out in both directions.
Call Jeff, talk with him in person. Buy the dl he offered above. Sounds like you need it either way.