CNJ - Unfortunately that link you posted is only for the front differential. He's looking for the actuator on the transfer case itself.
Also, I can't remember the last time seeing one but I thought it was supposed to come with the rods and you have to tear into the transfer case to install it. At least that's what a buddy of mine had to do on a V6 4runner quite a while ago.
I think I'm correct if only judging by this illustration: