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Bought mine at autozone...In order to craddle the arm I had to install it starting at the skinny end and of the arm and sliding it into position. That was on my 2WD with the draglink still connected.
I've never used one, I just hit the side of the pitman arm with the steering attatched with a big hammer and they usually pop off. There was the one though, that required 2 peices of chain welded to the side of the arm and a bottle jack in the middle, but I think that was a rare one.